Please Explain: 525,600 Minutes

The Leonard Lopate Show | May 10, 2010
Thomas O'Brian, chief of the Time and Frequency Division of the National Institute of Standards and Technology, gets to the bottom of how we measure time.

» More on the Time and Frequency Division
» More on the Please Explain series

Top Stories

Voter data shows lower turnout, but pockets of engagement boosted insurgent candidates

Feds indict former Mayor Adams adviser Frank Carone in migrant housing bribery scheme

Primary Day Results

Inside the Trump White House

YOU ARE ONLINE