Thomas O'Brian

Sep. 24, 2010

Testing Relativity With Better Clocks

With a precise enough clock, it's possible to test the time-dilation effects predicted by Einstein's theory of relativity -- without a space ship.

time, relativity, clocks, einstein

Feb. 29, 2008

Telling Time: Leap Year, Leap Day

This Friday is a date that comes only once every 28 years - Friday, February 29th. We'll talk about leap years, leap days, and the finer points of telling time.

time, date, leap year, calendar

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Michael Pollan Talks Plants and Food

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Building Bridges From Plastic Shampoo Bottles

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