Doctors at a hospital in Aleppo, Syria, treat a boy injured in what the government said was a chemical weapons attack on March 19. Syria's government and rebels accused each other of firing a rocket loaded with chemical agents outside of Aleppo. George Ourfalian/Reuters/Landov hide caption

itoggle caption George Ourfalian/Reuters/Landov
iStockphoto.com

Parents can minimize the negative impact of their arguments on their children using a few simple techniques to calm down. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A miniature ninja throwing star or a surgical device? The microgripper, shown here coming out of a catheter tube, is activated by body heat. The sharp appendages fold up when the device warms up. Evin Gultepe, Gracias Lab, Johns Hopkins University. hide caption

itoggle caption Evin Gultepe, Gracias Lab, Johns Hopkins University.

SWAT team members stand guard on the campus of Massachusetts General Hospital following the explosions at the finish line of the Boston Marathon. Michael Dwyer/AP hide caption

itoggle caption Michael Dwyer/AP

The bean of the castor-oil plant, Ricinus communis, is used in the production of castor vegetable oil and ricin, a poison. Sasha Vasko/via Flickr hide caption

itoggle caption Sasha Vasko/via Flickr

Musician Jake Orrall performs onstage at the Coachella Valley Music & Arts Festival on April 14. Temporary hearing loss following concerts and other loud events may protect our ears from more permanent damage. Frazer Harrison/Getty Images for Coachella hide caption

itoggle caption Frazer Harrison/Getty Images for Coachella

Lou Ann Schachner, 84, and Jay Schachner, 81, are volunteers with the Northwestern University SuperAging Project. They keep track of all their plans in a shared calendar. She loves to cook and study French and he is a part-time tax lawyer. Samantha Murphy for NPR hide caption

itoggle caption Samantha Murphy for NPR

An older man performs exercises in Mumbai, India. Research suggests that moderate physical exercise may be the best way to keep our brains healthy as we age. Rajesh Kumar Singh/AP hide caption

itoggle caption Rajesh Kumar Singh/AP