The side of Jupiter's moon Europa that faces the giant planet. NASA/JPL/University of Arizona hide caption
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Saturday
When dogs show the whites of their eyes in a "half-moon" shape it can indicate stress. Kristina Stas/iStockphoto.com hide caption
Efforts aimed at teen drinking and driving help reduce deaths, but so do broader alcohol control efforts. Roy Morsch/Corbis RM Stills/Getty Images hide caption
Friday
Neanderthal hunters cutting up their kill. Michel Grenet/Science Source hide caption
Join us at noon for a Twitter chat! NPR hide caption
The Large Hadron Collider uses superconducting magnets to smash sub-atomic particles together at enormous energies. CERN hide caption
Weasel Apparently Shuts Down World's Most Powerful Particle Collider
Sharon Long in her workshop. Courtesy of Sharon Long hide caption
Reborn At 40, She Uncovered New Life In A 'Dream' — Looking At Skulls
Thursday
Tracy Smith, 38, and her children Hazel, 8, and Finley, 5, at their home in Houston. Smith is pregnant with twins and says she's a little more worried than usual about the approach of mosquito season. Carrie Feibel/Houston Public Media hide caption
In Houston, Pregnant Women And Their Doctors Weigh Risks Of Zika
An artist's rendering of the "Red Dragon" capsule that SpaceX is planning to land on the surface of Mars — perhaps sometime in the next two years. SpaceX hide caption
Fraternal twins come from two separate eggs, unlike identical twins. Owen Franken/Corbis Documentary/Getty Images hide caption
Wednesday
Months after a concussion or other traumatic brain injury, you may sleep more hours, but the sleep isn't restorative, a study suggests. iStockphoto hide caption
A Concussion Can Lead To Sleep Problems That Last For Years
The earliest records of tiger nuts date back to ancient Egypt, where they were valuable and loved enough to be entombed and discovered with buried Egyptians as far back as the 4th millennium B.C. Now, tiger nuts are making a comeback in the health food aisle. Nutritionally, they do OK. Matailong Du/NPR hide caption
MRI scans suggests words stimulate different regions of the brain depending on their meaning. Alexander Huth/Nature hide caption
Tuesday
Sauropods were one of the most successful groups of dinosaurs to ever walk the Earth. New research helps explain why. Stocktrek Images/Getty Images hide caption