Instructions for the colon screening test were devised so they can be understood in any language. Courtesy of Kaiser Permanente Center for Health Research hide caption

itoggle caption Courtesy of Kaiser Permanente Center for Health Research

Up till now, all babies have had two genetic parents. That could soon change. Klöpper & Eisenschmidt GbR/iStockphoto hide caption

itoggle caption Klöpper & Eisenschmidt GbR/iStockphoto

Blair Roberts, a 22-year-old sales associate at Colorado E-Smokes, "vapes" with an electronic cigarette in the Aurora, Colo., store. In the absence of federal rules, Colorado is among states that considered its own age requirements for the nicotine-delivery devices. Ed Andrieski/AP hide caption

itoggle caption Ed Andrieski/AP