A new study suggests wrangling your kids to bed at the same time each night could help set them up for a healthier future. AleksandarNakic/Getty Images hide caption
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biological clock
Tuesday
Tuesday
Age takes a toll on our internal clocks. Universal Stopping Point Photography/Getty Images hide caption
As Aging Brain's Internal Clock Fades, A New Timekeeper May Kick In
Tuesday
Circadian Surprise: How Our Body Clocks Help Shape Our Waistlines
Monday
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
Wednesday
Boy meets girl, sperm meets egg — how much does the age of each matter? James Steidl/Kyle Gruba/iStockphoto hide caption
Thursday
Your skin knows the time. iStockphoto.com hide caption
Tuesday
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