I’m building a passive house in Canada, it’s always difficult to explain it to the folks who live in our cold climate and are not familiar with the passive house concept that there’s no “heating “ or “air conditioning” in the house. This hopefully makes it easier! Thank you for posting it. P.S: German Technology IS the best!
History Bo Adamson, co-originator of the passive house concept. Wolfgang Feist, co-originator of the passive house concept, and founder of the 'Passivhaus Institut' The Passivhaus standard originated from a conversation in May 1988 between Bo Adamson of Lund University, Sweden, and Wolfgang Feist of the Institut für Wohnen und Umwelt (Institute for Housing and the Environment, Darmstadt, Germany).[11] Later, their concept was further developed through a number of research projects,[12] aided by financial assistance from the German state of Hessen. Much of the early 'Passive Houses' were based on research and the experience of North American builders during the 1970s,[13] who - in response to the oil embargo - sought to build homes that used very little or no energy. These designs often utilized the sun as a heat source and the term 'passive house' was possibly derived from the passive solar features of these houses, such as the Saskatchewan Conservation House and the Leger House in Pepperell, Massachusetts. An early book explaining the concepts was The Passive Solar Energy Book by Edward Mazria in 1979.[14]
We are moving into our passive house in Kingston Ontario next month and I couldn't be more excited. It looks and performs spectacularly!! We achieved a .57 ACH blower door test and it is so cozy inside even in a Canadian winter. I use this video to explain to my friends exactly what it is as they often hear about net zero but not much about passive. Passive makes net zero a lot easier to accomplish.
It's very tricky to talk about most of anything within 90 seconds. I guess I'm a bit biased living in cooling dominated climate, but all strategies are still applied, just as they regard to keeping the heat out of the house/building.
Not an expert but I know people with passive houses in hot climates like Texas and Australia. The idea is during the night all windows and doors are open to ventilate fresh air into the house. In the morning once the temp gets to a certain amount, everything closes and the way the house is built, it traps that chilly air inside. You can also have fans in the house. Passive house doesn't mean 0 energy usage, just as little as possible. You use the solar panels for running the fans if needed.
Hello, dear Hans-Jörn Eich, I am a trainer (and passive house architect) in Slovakia, could i translate your short cartoon to Slovak language (and correct the info about dr. Feist - he is German and he build 1st passive house in Germany)? Of course I would write that you are the author... Zuzana
One further step that could be taken in an urban setting is to provide these houses with Solar panels for electricity and Solar thermal for central heating and water heating. Interconnecting neighbouring buildings to set up a peer-to-peer system where they are able to exchange and redistribute power where necessary. Ideally they would produce a surplus of energy which then could be fed into a big grid where the transport sector could be supported.
This is a really great video and I've shown it to a lot of people! I do have a criticism which is that a Certified Passive House in a cool/cold climate will most probably require some heating to remain above the Certification temperature threshold of 20 degrees Celcius in the middle of winter. However it will not need a full central heating system as would be required in other "typical" buildings in that climate. The permissible heating load for a Certified Passive House in ANY climate zone is 10W/m2 of the Treated Floor Area - this is not Zero W/m2! Conversely in a warm/hot climate there is likely to be a requirement for cooling so that there is not too much overheating, but again, only a small percentage of the cooling that would normally be required in a typical building in a warm/hot climate.
I think that umbrella (insulating) concept is more important in Canada and Scandinavia than in most of the Continental USA, with mean temperatures around 50 degrees Fahrenheit. Much of Arizona and Colorado are ideal for relatively inexpensive passive homes, with a big advantage in available solar than most other places. In AZ and CO, the controlling minimum is water.
@@yuosyo NO SWEARING IN OUR CHRISTIAN MINECRAFT SERVER!!! MY MOM IS WATCHING ME AND WILL GET VERY ANGRY AT YOU ALL IF SHE CATCHES YOU SWEARING!!!!!!!!!
Why these with rock wall? Center rock heat dissipator sensible, walls? Really, skyscraper weight bearancible walls😂 wood beam frame, corner stone type ground parts, thin wall with eps or epu. There, a small power demanding, Sense of heat. And affordable
this is horsesht. They act like retrofitting homes is nothing. And then region matters because no amount o huffing and puffing inside makes up for the "thermal bridge" that 30 below weather outside will cruise in on
Hi Hans-Jorn, Great video, would you mind if I embed the video into our website. We are developing homes in the UK to the passive house standard, our biggest barrier is teaching home owners what a passive is! Of course I’ll use the Wordpress widget to link back to the original and I can credit you or your organisation. Www.purehaus.co.uk
Sorry, I didn't see your question before. You can embed the video at any point. (it's under a creative commons license 3.0 so you can use it, please just give me credit. As long as you don't monetise it, all is good.)
well done, the basics, instead of trying to sell us some thing. which book would you recommend if you have not got a fortune to spend on a passive home, in the northern hemisphere.
Is this only applicable on places where there's more effort to heat a house rather than cooling it? Or are there approach on how to passively cool down a house?
Hello Hans-Jorn . Love your video its very cool - was emailing to ask permission to use the video please for our promotional material. look forward to hearing back from you kind regards Shelley Cresswell Marketing Manager eHaus NZ
Of course in a cooling climate, that TV, et cetera, hurts you in the summer. One discussion happening right now is how to treat photovoltaic electric generation within the Passive House methodology.
Yes, conversations will always keep going, and we will get better at it. In PHPP, the heating caused by internal sources, is taken into consideration and would be offset by the proper amount of cooling and shading. As for photovoltaics, I'd keep that separate. Build a proper Passive House and then use the power generation to make it Net Zero (or even off grid), that's the simplest way to look at it. (BTW, I once calculated that each kW created by Photovoltaics is currently still 10x more expensive than each kW saved by the building technique of a passive house).
Good morning Hans, Congratulations for the video. It is amazing how you managed to explain it so clearly in such a short time. Gorgeous! I began as a Passive House builder last 2021 in the North-East area of Spain and I would be very pleased if I could embed the video with a language translation in my new website. Thanks in advanced for your answer.
Now, let's make it from simple local materials such as trees, mud, and agricultural waste. Let's also make it super cheap so everyone can get it. And let's make a universal modular design that can conveniently fit the users needs, and you can easily build it yourself. Oh and it harvests its own rainwater. And grows food. Using the wastewater. And it produces, stores and sells electricity to the micro-grid. And you can stack'em into urban units.
Wow Im writing a piece on this. Thank you so much. I read like 5 articles and no one was telling ACTUALLY where the heat was coming from.. Wow; from one's body just like that. Amazing !
Wouldn't digging a pit (in your basement or other area) to tap the natural 60 or so degree heat 10 feet down (whatever the distance to get beneath the frost layer) be more economical? In the cold the heat transfer would leave you house at 60 degrees no matter what the temperature outside and its cheaper to heat from 60 to 70 than from 0 to 70. in the summer your house would be a natural 6o which would be perhaps a bit chilly when its sweltering out. Am I missing something? Maybe the two systems can be combined.
PH eliminates 90% of the load, making complex earth heat systems redundant. any additional needs can be provided by simple strip heaters and minisplits.
Thanks for sharing! I suspect that 90% of the principals carry across for cooling! But could you comment on the 10% as heat extraction would be addressed slightly differently.
Good morning Hans, Great video! We are a certified Passive House builder in Colorado. We would love to show your video on our website with your permission? We look forward to hearing from you!
helps but not for today when we use LED of less heat. The name is misguide as stove and light are not passive. Would you please give real guide to say how a 1000 sqft single family house can be such passive? what are the insulation, seal and vent is needed?
Heat doesn't enter in summer, just as heat doesn't escape in winter. However, in extreme climates, a simple strip heater and/or minisplit AC make up the difference without central heat/AC.
Great video. Would you know if there is a comparison for heat loss of one single triple layer glass window compared to two double glass layer windows separated 30 centimeters apart? Old houses in Germany, Austria, Slovenia and Croatia had such double windows, separated some 20 cm to 30 cm apart, providing very good heat retention.
DeksZagreb I’m not sure if I understand your question correctly. A single insulated glasing unit with three layers of glass with krypton inbetween can have a u-value as low as 0.5. An insulated glasing unit with two panels of Glas can go as low as 1.1 (from memory, maybe even lower). If you put two in “series”, you should be able to calculate it just like adding different layers in a wall together (keep the air films in mind; it’s also the same way you add resistors together). BTW, many passive houses use this strategy for their glasing, especially older renovations/Restauration in Europe where they want to keep the style and look, and possibly even the old frames.
I meant double windows like the following: www.stolarija-roncevic.hr/images/galerije/stolarija/2/prozor-drveni-dupli.jpg How could we calculate the heat loss of such double windows with dual pane glass compared to a single window with triple pane glass? In one house I have the double windows at 20 cm apart while in the other I have these double windows at 30 cm apart, both walls are 60cm thick. Both houses are more than 100 years old, I renovated them a couple years ago. I would like to build a new passive house so I am trying to determine the heat loss compared to windows cost. Hence it would help if I could calculate whether a single window with triple pane glass would be more cost efficient than a double window with dual pane glass, compared to heat loss per year.
I thought there might be a rule of thumb to calculate the heat loss through the window panes... As a wild guess, the triple pane argon/kripton single window should have more losses than the double window dual pane glass with 20 cm of air tight space inbetween.
DeksZagreb the formula for adding two resistors in series (just like the heat resistance of the two double panes together) is 1/R=(1/R)+(1/R). At a resistance of Ug=1.1 per each is 0.55 added together. I’m not sure what the 200mm air layer and the convective air movement would do to this, but that’s probably a pretty good start.
QUBED Architecture thanks. I also created an updated version fixing a few “mistakes” and there are a few other languages available as well. You can find it on Vimeo. Cheers. Keep on doing great work.
Nice explanation, I wished it was that easy and true. Because it is not. I live in South Florida and without A/C you get baked in your house, passive or not. All the insulation and those super windows (which are really nice and very good) are also very, very expensive. Maybe more than using the A/C...It may work in colder climate, or maybe in San Diego where you don't have hot summers nor cold winters, but not in Chicago or West Palm Beach.
It does work, and you may not even need triple pane windows in Florida. What you do need is proper thermal protection in your walls, which prevents heat from reaching the inside, and correct shading. A good passive house designer should see if the house is overheating in PHPP before anything is built. Also, A/C is not "forbidden" the same way that heating is not forbidden, it just needs to stay within a specific amount of energy consumption.
Actually it works great in Australia too. If you think there is no way without AC then clearly you're not very familiar with the notion of passive houses.
They work in extreme climates. That's where they are tested. However, any additional load can be handled by a simple strip heater or minisplit AC without expensive central systems.
just for the record, I didn't say which country he is from, I just said where he is (he mainly practices in Innsbruck, Austria.). I was trying to avoid once again to tap the Germans on the shoulder (I'm one myself). But that backfired on me. I'll have to change that on a future version of this video.
I didn't say what his nationality is. He practices (and teaches) in Austria. I didn't want to go down the road of "look at us Germans, look how great we are"... I guess that's a complex that many Germans have. But with this video it surely backfired (I did record a new version where I left that out completely.) Thanks for your comment though.
I’m building a passive house in Canada, it’s always difficult to explain it to the folks who live in our cold climate and are not familiar with the passive house concept that there’s no “heating “ or “air conditioning” in the house. This hopefully makes it easier! Thank you for posting it.
P.S: German Technology IS the best!
History
Bo Adamson, co-originator of the passive house concept.
Wolfgang Feist, co-originator of the passive house concept, and founder of the 'Passivhaus Institut'
The Passivhaus standard originated from a conversation in May 1988 between Bo Adamson of Lund University, Sweden, and Wolfgang Feist of the Institut für Wohnen und Umwelt (Institute for Housing and the Environment, Darmstadt, Germany).[11] Later, their concept was further developed through a number of research projects,[12] aided by financial assistance from the German state of Hessen.
Much of the early 'Passive Houses' were based on research and the experience of North American builders during the 1970s,[13] who - in response to the oil embargo - sought to build homes that used very little or no energy. These designs often utilized the sun as a heat source and the term 'passive house' was possibly derived from the passive solar features of these houses, such as the Saskatchewan Conservation House and the Leger House in Pepperell, Massachusetts. An early book explaining the concepts was The Passive Solar Energy Book by Edward Mazria in 1979.[14]
Hello, Have you moved house? Can you give detailed information about this subject? I'm thinking of getting it done too. Have a nice day
actually the explanation was only 84 seconds. you beat your own record.
We are moving into our passive house in Kingston Ontario next month and I couldn't be more excited. It looks and performs spectacularly!! We achieved a .57 ACH blower door test and it is so cozy inside even in a Canadian winter. I use this video to explain to my friends exactly what it is as they often hear about net zero but not much about passive. Passive makes net zero a lot easier to accomplish.
Living with a smaller footprint is good. Net zero is an extreme goal whose single-minded pursuit is likely to cause more harm than good.
It's been a year, can you post a followup message about how it's working?
I wish you talked about cooling as well It becomes more and more important
It's very tricky to talk about most of anything within 90 seconds. I guess I'm a bit biased living in cooling dominated climate, but all strategies are still applied, just as they regard to keeping the heat out of the house/building.
Not an expert but I know people with passive houses in hot climates like Texas and Australia. The idea is during the night all windows and doors are open to ventilate fresh air into the house. In the morning once the temp gets to a certain amount, everything closes and the way the house is built, it traps that chilly air inside. You can also have fans in the house. Passive house doesn't mean 0 energy usage, just as little as possible. You use the solar panels for running the fans if needed.
Hello, dear Hans-Jörn Eich, I am a trainer (and passive house architect) in Slovakia, could i translate your short cartoon to Slovak language (and correct the info about dr. Feist - he is German and he build 1st passive house in Germany)? Of course I would write that you are the author... Zuzana
One further step that could be taken in an urban setting is to provide these houses with Solar panels for electricity and Solar thermal for central heating and water heating. Interconnecting neighbouring buildings to set up a peer-to-peer system where they are able to exchange and redistribute power where necessary. Ideally they would produce a surplus of energy which then could be fed into a big grid where the transport sector could be supported.
This is a really great video and I've shown it to a lot of people!
I do have a criticism which is that a Certified Passive House in a cool/cold climate will most probably require some heating to remain above the Certification temperature threshold of 20 degrees Celcius in the middle of winter. However it will not need a full central heating system as would be required in other "typical" buildings in that climate. The permissible heating load for a Certified Passive House in ANY climate zone is 10W/m2 of the Treated Floor Area - this is not Zero W/m2!
Conversely in a warm/hot climate there is likely to be a requirement for cooling so that there is not too much overheating, but again, only a small percentage of the cooling that would normally be required in a typical building in a warm/hot climate.
Perfect limited job for strip heaters or minisplit.
I think that umbrella (insulating) concept is more important in Canada and Scandinavia than in most of the Continental USA, with mean temperatures around 50 degrees Fahrenheit. Much of Arizona and Colorado are ideal for relatively inexpensive passive homes, with a big advantage in available solar than most other places. In AZ and CO, the controlling minimum is water.
Dang, how did UA-cam make it 91 seconds? It worked everywhere else!
This video is shit
@@nntflow7058 No thanks. My wife wouldn't appreciate that. But You can simply speed the video up if you want. Peace.
@@ryanstrilchuk5870 Thanks for you attention. More F's given than most other people. Peace.
@@ryanstrilchuk5870 WHY ARE YOU SWEARING IN THE CHRISTIAN MINECRAFT SERVER?!
@@yuosyo NO SWEARING IN OUR CHRISTIAN MINECRAFT SERVER!!! MY MOM IS WATCHING ME AND WILL GET VERY ANGRY AT YOU ALL IF SHE CATCHES YOU SWEARING!!!!!!!!!
Why these with rock wall? Center rock heat dissipator sensible, walls? Really, skyscraper weight bearancible walls😂 wood beam frame, corner stone type ground parts, thin wall with eps or epu. There, a small power demanding, Sense of heat. And affordable
Germany, not Austria. The first passive house is in Darmstadt-Kranichstein.
Etlv Sti2d en force
this is horsesht. They act like retrofitting homes is nothing. And then region matters because no amount o huffing and puffing inside makes up for the "thermal bridge" that 30 below weather outside will cruise in on
Hi Hans-Jorn,
Great video, would you mind if I embed the video into our website. We are developing homes in the UK to the passive house standard, our biggest barrier is teaching home owners what a passive is! Of course I’ll use the Wordpress widget to link back to the original and I can credit you or your organisation.
Www.purehaus.co.uk
Sorry, I didn't see your question before. You can embed the video at any point. (it's under a creative commons license 3.0 so you can use it, please just give me credit. As long as you don't monetise it, all is good.)
well done, the basics, instead of trying to sell us some thing. which book would you recommend if you have not got a fortune to spend on a passive home, in the northern hemisphere.
Is this only applicable on places where there's more effort to heat a house rather than cooling it? Or are there approach on how to passively cool down a house?
both. any additional needs can be provided by simple strip heaters and minisplits.
What about warm summer months?
Hello Hans-Jorn . Love your video its very cool - was emailing to ask permission to use the video please for our promotional material. look forward to hearing back from you kind regards Shelley Cresswell Marketing Manager eHaus NZ
of course. embed it anywhere, just credit me/us. (You can also use the vimeo versions to be embedded)... And sorry for the super late response.
could you make a video that focuses on passive house for a hot climate, thanks!
Of course in a cooling climate, that TV, et cetera, hurts you in the summer. One discussion happening right now is how to treat photovoltaic electric generation within the Passive House methodology.
Yes, conversations will always keep going, and we will get better at it. In PHPP, the heating caused by internal sources, is taken into consideration and would be offset by the proper amount of cooling and shading. As for photovoltaics, I'd keep that separate. Build a proper Passive House and then use the power generation to make it Net Zero (or even off grid), that's the simplest way to look at it. (BTW, I once calculated that each kW created by Photovoltaics is currently still 10x more expensive than each kW saved by the building technique of a passive house).
Amazed you covered all that in 90 seconds. Many thanks! :)
Good morning Hans, Congratulations for the video. It is amazing how you managed to explain it so clearly in such a short time. Gorgeous!
I began as a Passive House builder last 2021 in the North-East area of Spain and I would be very pleased if I could embed the video with a language translation in my new website. Thanks in advanced for your answer.
Now, let's make it from simple local materials such as trees, mud, and agricultural waste. Let's also make it super cheap so everyone can get it. And let's make a universal modular design that can conveniently fit the users needs, and you can easily build it yourself. Oh and it harvests its own rainwater. And grows food. Using the wastewater. And it produces, stores and sells electricity to the micro-grid. And you can stack'em into urban units.
Wow Im writing a piece on this. Thank you so much. I read like 5 articles and no one was telling ACTUALLY where the heat was coming from.. Wow; from one's body just like that. Amazing !
Nice explanation!
Thanks.
Wouldn't digging a pit (in your basement or other area) to tap the natural 60 or so degree heat 10 feet down (whatever the distance to get beneath the frost layer) be more economical? In the cold the heat transfer would leave you house at 60 degrees no matter what the temperature outside and its cheaper to heat from 60 to 70 than from 0 to 70. in the summer your house would be a natural 6o which would be perhaps a bit chilly when its sweltering out. Am I missing something? Maybe the two systems can be combined.
PH eliminates 90% of the load, making complex earth heat systems redundant. any additional needs can be provided by simple strip heaters and minisplits.
it's hard to get the heat out of the house in summer
Excellent
Thanks for sharing! I suspect that 90% of the principals carry across for cooling! But could you comment on the 10% as heat extraction would be addressed slightly differently.
both. any additional needs can be provided by simple strip heaters and minisplits.
Good morning Hans, Great video! We are a certified Passive House builder in Colorado. We would love to show your video on our website with your permission? We look forward to hearing from you!
helps but not for today when we use LED of less heat. The name is misguide as stove and light are not passive. Would you please give real guide to say how a 1000 sqft single family house can be such passive? what are the insulation, seal and vent is needed?
WHERE DO THEY GET THE ENERGY
Bro u should start making videos again, this was helpful👍
How do you cool it down on summers?
Heat doesn't enter in summer, just as heat doesn't escape in winter. However, in extreme climates, a simple strip heater and/or minisplit AC make up the difference without central heat/AC.
Amazing summary!
Great video. Would you know if there is a comparison for heat loss of one single triple layer glass window compared to two double glass layer windows separated 30 centimeters apart? Old houses in Germany, Austria, Slovenia and Croatia had such double windows, separated some 20 cm to 30 cm apart, providing very good heat retention.
DeksZagreb I’m not sure if I understand your question correctly. A single insulated glasing unit with three layers of glass with krypton inbetween can have a u-value as low as 0.5. An insulated glasing unit with two panels of Glas can go as low as 1.1 (from memory, maybe even lower). If you put two in “series”, you should be able to calculate it just like adding different layers in a wall together (keep the air films in mind; it’s also the same way you add resistors together). BTW, many passive houses use this strategy for their glasing, especially older renovations/Restauration in Europe where they want to keep the style and look, and possibly even the old frames.
I meant double windows like the following:
www.stolarija-roncevic.hr/images/galerije/stolarija/2/prozor-drveni-dupli.jpg
How could we calculate the heat loss of such double windows with dual pane glass compared to a single window with triple pane glass? In one house I have the double windows at 20 cm apart while in the other I have these double windows at 30 cm apart, both walls are 60cm thick. Both houses are more than 100 years old, I renovated them a couple years ago.
I would like to build a new passive house so I am trying to determine the heat loss compared to windows cost. Hence it would help if I could calculate whether a single window with triple pane glass would be more cost efficient than a double window with dual pane glass, compared to heat loss per year.
DeksZagreb okay. The answer I gave above does apply then. Maybe you just need to find a building physicist or an energy consultant to ask.
I thought there might be a rule of thumb to calculate the heat loss through the window panes... As a wild guess, the triple pane argon/kripton single window should have more losses than the double window dual pane glass with 20 cm of air tight space inbetween.
DeksZagreb the formula for adding two resistors in series (just like the heat resistance of the two double panes together) is 1/R=(1/R)+(1/R). At a resistance of Ug=1.1 per each is 0.55 added together. I’m not sure what the 200mm air layer and the convective air movement would do to this, but that’s probably a pretty good start.
cooling?
That's cool... 8-) (I did mention cooling, but it can obviously also have cooling, just not as much as is required on a big wasteful house)
Why is this not the building code everywhere?
Great overview of PassivHaus
QUBED Architecture thanks. I also created an updated version fixing a few “mistakes” and there are a few other languages available as well. You can find it on Vimeo. Cheers. Keep on doing great work.
And the proper insulation with airpop
I think this is best explanation :)
Thanks... not necessarily the best, but I hope the shortest :)
What a small world! Cheers Hans!, awesome video and yes you made it in 90 sec lol!
good movie
The drawings are all beautiful!! 👏🏻👏🏻👏🏻
Am i the only one who likes a cold and drafty house or what 😂 like naturally im not talking air con im talking cave level natural cold
very inspiring - love it
triple pane glass
You can also spell it triple pain glass, as that's how my back feels when we install these windows
about as long as it takes for me to blow! which this idea does.
why does it blow? Have you been in a passive house?
@@myphonyaccount it means its brilliant
Austria?
I LOVE A HOME WORK !!!!!!!!!
how the hot air can escape?
It never enters.
Nice explanation, I wished it was that easy and true. Because it is not. I live in South Florida and without A/C you get baked in your house, passive or not. All the insulation and those super windows (which are really nice and very good) are also very, very expensive. Maybe more than using the A/C...It may work in colder climate, or maybe in San Diego where you don't have hot summers nor cold winters, but not in Chicago or West Palm Beach.
It does work, and you may not even need triple pane windows in Florida. What you do need is proper thermal protection in your walls, which prevents heat from reaching the inside, and correct shading. A good passive house designer should see if the house is overheating in PHPP before anything is built. Also, A/C is not "forbidden" the same way that heating is not forbidden, it just needs to stay within a specific amount of energy consumption.
Actually it works great in Australia too. If you think there is no way without AC then clearly you're not very familiar with the notion of passive houses.
They work in extreme climates. That's where they are tested. However, any additional load can be handled by a simple strip heater or minisplit AC without expensive central systems.
Doesn't where the house is located affect this method? A house in Florida as opposed to a house in New York?
O. Robau it certainly does. It's all taken into consideration in PHPP
it does very much. But PassiveHouse is a design method, so it takes that in consideration.
Dr. Feist is from Germany.
just for the record, I didn't say which country he is from, I just said where he is (he mainly practices in Innsbruck, Austria.). I was trying to avoid once again to tap the Germans on the shoulder (I'm one myself). But that backfired on me. I'll have to change that on a future version of this video.
I didn't say what his nationality is. He practices (and teaches) in Austria. I didn't want to go down the road of "look at us Germans, look how great we are"... I guess that's a complex that many Germans have. But with this video it surely backfired (I did record a new version where I left that out completely.) Thanks for your comment though.
Bro im in a middle of exam. U r talking about the physicists
Learnt more than 4 years at school😂