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. Writing this week in the journal Science, researchers at NIST describe their experiments using two highly-precise aluminum ion atomic clocks, linked by an optical fiber. Due to the precision of the clocks, they were able to observe differences in the passage of time over a height difference of just 33 centimeters, or at speeds as low as 20 miles per hour. We'll talk about the work and what it shows.
Produced by Christopher Intagliata, Senior Producer