A single Lassa fever virus particle, stained to show surface spikes — they're yellow — that help the virus infect its host cells. London School of Hygiene & Tropical Medicine hide caption

itoggle caption London School of Hygiene & Tropical Medicine

New York University announced it will not require the criminal record of prospective students in the first round of the admissions process. Jpellgen/Flickr hide caption

itoggle caption Jpellgen/Flickr

One of these things is not like the other: A 3-D printed model of a beige cowbird egg stands out from its robin's egg nest mates, though their shape and heft are similar. Ana Lopez/Courtesy of Mark Hauber hide caption

itoggle caption Ana Lopez/Courtesy of Mark Hauber

Los Angeles started offering a $3.75 rebate on every square foot of grass replaced with a drought-friendly landscape. The drought is a boost in business for local conservation entrepreneurs. Frederic J. Brown/AFP/Getty hide caption

itoggle caption Frederic J. Brown/AFP/Getty

Seattle Space Needle elevator operator Michael Hall says despite the success of the attraction, his pay hasn't budged in four years. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP