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NOVA
What Gives Hot Peppers Their Heat?
When you eat peppers, the chemical capsaicin fits into the heat pain receptors in your mouth, sending a false signal that’s identical to the one your brain would receive if you ate something literally burning hot.
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Journey back to the beginning of everything: the universe, Earth, and life itself.
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53:50
An American combat hospital mobilized in Iraq faces a daily drama of wartime treatment.
53:06
Will experimental particle physics confirm the wild predictions of string theory?
52:56
Do miniscule vibrating strands of energy hold the key to a unified theory of physics?
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Combining the laws of the universe in one theory that explains it all is the Holy Grail
