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It's Okay to Be Smart
Einstein Was Right: Gravitational Waves Edition
Season 4
Episode 23
A theory of physics 100 years in the making.
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2:13
Evolution has given us the gifts we need to survive this difficult time. Here's how.
10:52
Celebrating 30 years of the Hubble Space Telescope.
12:19
Do the supposed advantages for springing forward and falling back hold up?
8:23
The sunlight we see is tens of thousands of years old. How is that possible?
11:30
I went to NASA in Houston to talk to astronaut Don Pettit.