How Much Starlight Has Been Emitted Since the...

The @ sign goes by many names today, but it's only so commonplace because of medieval merchants and one 1970s programmer. Learn more about the at sign (or arroba, Klammeraffe, strudel, grisehale, or gül) in this episode of BrainStuff, based on this article: https://people.howstuf ...  Show more

A human fetus doesn't develop retinas until around gestational week 28. Learn how researchers have tried to figure out what babies can see in the few remaining weeks before they're born in this classic episode of BrainStuff, based on this article: https://health.howstuffworks.com ...  Show more

How dark matter was discovered, and what it might be

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Can physicists discover new particles by watching how muons wiggle in magnetic fields?

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Daniel talks about how astronomers can measure or deduce the mass of a star, and why it controls its fate.

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Why can't we travel faster than light? Can we ever reach the stars?

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