Visitors crowd the Las Vegas Strip to celebrate the new year. Glenn Pinkerton/AP hide caption

Computer networks and GPS systems are only possible because of the precision timekeeping of atomic clocks like the one above, says clockmaker and physicist Jun Ye. Ye Group and Baxley/JILA hide caption

Recording Academy President and CEO Neil Portnow, host LL Cool J and Executive Vice President of Specials, Music and Live Events at CBS Entertainment Jack Sussman pose at the Staples Center in Los Angeles on Jan. 23, a few days before the 2014 Grammy Awards. Kevin Winter/WireImage hide caption

As a parent, how would you rate this moment on a scale of 1 to 5? In her new book All Joy and No Fun, Jennifer Senior says parenting research sometimes fails to quantify the joy of having a child. iStockphoto hide caption

Insurers get paid more for older people under the Affordable Care Act, even if they're healthy. Tony Ding/AP hide caption

Jason Amundsen of Locally Laid Egg Co. is one of four finalists in Intuit's Small Business, Big Game competition. Intuit says some 15,000 small businesses entered the contest. Craig Lassig/Invision/AP hide caption

A fireball goes up at the site of an oil train derailment in Casselton, N.D., in December. Bruce Crummy/AP hide caption

Choose wisely: What Mom eats during pregnancy can set the stage for obesity in her baby. Meg Vogel/NPR hide caption