Meet the Expert: Dr. Katie O'Sullivan, Where did the Moon Come From

Where did the moon come from? What were the first rocks to form on the moon? Why do the near side and far side of the moon look so different? Dr. Katie O'Sullivan is a planetary geologist who uses lunar meteorites to try to answer these questions.
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[@JamesJackson-lw1ps]

"We figured it out in the late sixties and early seventies but now we're trying to figure it out again". How does that make any sense at all? Please help me understand.