Our big, beautiful sky stretches all the way from the ground beneath our feet to about sixty miles above the Earth. It’s made up of countless air molecules, pinging around like tiny, invisible pinballs. And even though we can’t feel the weight of each individual air molecule, all together they weigh a lot! But how much does the sky actually weigh? (spoiler alert: it involves lots and lots of farting cats…) Molly and co-host Felix learn more by talking with a band of singing walruses and a pretty wacky weatherwoman. And don’t miss this week’s extra mysterious Mystery Sound!

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About Brains On:
Brains On! is an award-winning audio show for kids and families. Each week, a different kid co-host joins Molly Bloom to find answers to fascinating questions about the world. Our mission is to encourage kids’ natural curiosity and wonder using science and history…but there’s no age limit on curiosity, and episodes of Brains On can be enjoyed by anyone.

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This video was animated by Brant Miller, with editing assistance from Chelsea Evans.