Farms outside Baghdad as seen from a U.S. Army Blackhawk helicopter. Much of Iraq's soil has a high salt content because of flooding and poor drainage. Jim Gordon/U.S. Army Corps of Engineers/Flickr hide caption

itoggle caption Jim Gordon/U.S. Army Corps of Engineers/Flickr

Magnified 25,000 times, this digitally colorized scanning electron micrograph shows Ebola virus particles (green) budding from an infected cell (blue). CDC/NIAD hide caption

itoggle caption CDC/NIAD

Caltech biochemical engineer Frances Arnold was awarded a National Medal of Technology and Innovation by President Obama in 2013. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov

After a hard day of bruising battle, ancient gladiators reached for a post-workout drink, according to an ancient account. New research backs that up. Stefano Bianchetti/Corbis hide caption

itoggle caption Stefano Bianchetti/Corbis

Patients with certain kinds of brain damage can wind up with locked-in syndrome: they may be able to think just fine, but are unable to communicate their thoughts to others. A recently published case study shows that a non-invasive brain-computer interface can help. iStockphoto hide caption

itoggle caption iStockphoto

Google vice president Alan Eustace is lifted by a balloon into the stratosphere, in a record-breaking skydive over New Mexico Friday. Paragon Space Development Corporation/Reuters /Landov hide caption

itoggle caption Paragon Space Development Corporation/Reuters /Landov