Why Is Our Moon Two-Faced?

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The near side of the Moon has a thin crust and is covered in maria. The far side has a thick crust and almost no maria. Scientists have spent the past six decades trying to figure out why these two halves are so different, and they've come up with some pretty nifty hypotheses in the process.

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Sources:
https://www.britannica.com/science/mare-lunar-feature
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Martin Jutzi correspondence
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Image Sources
https://www.gettyimages.com/detail/video/full-moon-close-up-stock-footage/599928584?phrase=moon%20in%20sky&adppopup=true
https://solarsystem.nasa.gov/resources/2460/lunar-near-side/?category=moons_earths-moon
https://solarsystem.nasa.gov/resources/2459/lunar-far-side/?category=moons_earths-moon
https://commons.wikimedia.org/wiki/File:Lunar_Thorium_concentrations.jpg
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https://www.flickr.com/photos/nasa2explore/52548765436/in/album-72177720303788800/
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https://commons.wikimedia.org/wiki/File:NASA_Lunar_Sample_60015.jpg
https://www.youtube.com/watch?v=aWCCNYJV3Zw