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This is Scientific American's 60-second science.

I'm Christopher in Taliatta.

The Apollo missions brought back 842 pounds of rock and soil from the moon, nearly 2,200 different samples.

But there's one sample that planetary scientist Manakshi-Wadha says is the most interesting of all.

Apollo 10085.

Neil Armstrong collected it on Apollo 11.

He was about to step back into the lunar module, and he turned around and just, he had this

rock box, and he saw little spaces, you know, in there, and he knew that these geologists

on Earth would be just so excited to study these materials.

He just scooped up, I think,

nine scoops of soil that he put into the box. And it became one of the most well-studied

samples of the Apollo mission, she says. A geologist named John Wood at the Smithsonian noticed

white flecks of rock in the soil, which he identified as a rock type called anorthosite.

And it clued him into the moon's ancient past.

And this was quite a leap of imagination,

but he proposed that the whole of the moon had at one time in the past,

...