Ever tried to comb a hairy ball? Math says you failed!

Direct download: The_Hairy_Ball_Theorem.mp4
Category:science & medicine -- posted at: 8:00am EST

A million dollars is a ton of money. But how much does it weigh?

Direct download: Weigh_a_million_dollars_with_your_mind.mp4
Category:science & medicine -- posted at: 8:00am EST

Why is the past different from the future? Caltech physicist Sean Carroll explains how the arrow of time is not an intrinsic property of physics, but rather an emergent feature.

Direct download: The_Arrow_of_Time_feat._Sean_Carroll.mp4
Category:science & medicine -- posted at: 8:00am EST

GPS is just a big clock in space! (and it can detect nuclear explosions)

Direct download: GPS_relativity_and_nuclear_detection.mp4
Category:science & medicine -- posted at: 8:00am EST

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