Age takes a toll on our internal clocks. Universal Stopping Point Photography/Getty Images hide caption

toggle caption Universal Stopping Point Photography/Getty Images

As Aging Brain's Internal Clock Fades, A New Timekeeper May Kick In

  • Download
  • <iframe src="https://www.npr.org/player/embed/460333217/460656846" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript
Katherine Streeter for NPR

Circadian Surprise: How Our Body Clocks Help Shape Our Waistlines

  • Download
  • <iframe src="https://www.npr.org/player/embed/389596946/392014882" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Strontium atoms floating in the center of this photo are the heart of the world's most precise clock. The clock is so exact that it can detect tiny shifts in the flow of time itself. Courtesy of the Ye group and Brad Baxley/JILA hide caption

toggle caption Courtesy of the Ye group and Brad Baxley/JILA

New Clock May End Time As We Know It

  • Download
  • <iframe src="https://www.npr.org/player/embed/361069820/361069821" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

It doesn't take a transcontinental flight to end up out of sync with your body clock. It might just be that you stay up too late. iStockphoto.com hide caption

toggle caption iStockphoto.com

Jet-Lagged By Your Social Calendar? Better Check Your Waistline

  • Download
  • <iframe src="https://www.npr.org/player/embed/152690836/152730022" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript