How Much Starlight Has Been Emitted Since the...

In South Carolina, the first school for formerly enslaved people during the Civil War shifted to become a center for social activism during the Civil Rights movement, and stands today as a landmark of African American culture and history. Learn more about the Penn Center in this ...  Show more

Cramming for a test or other deadline may give you decent short-term results, but research shows it sacrifices long-term comprehension and memory. Learn why study methods like spacing and interleaving are better in this classic episode of BrainStuff, based on this article: https: ...  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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