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14:28
Challenge question: if 1kg of apples is $5 and 2kg is $10, how much is -1kg of apples?
13:17
The hubble constant--the rate of expansion of our universe--has consumed astronomers.
13:50
The foundations of quantum theory rests on its symmetries.
13:08
Astronomers are the worst at naming things. Dark energy AND dark matter?
12:18
What you think is a perfect reflection might be universe that is fundamentally different.
13:43
Let me tell you a story about virtual particles. It may or may not be true.
