Embryoids like this one are created from stem cells and resemble very primitive human embryos. Scientists are studying them in hopes of learning more about basic human biology and development.
Courtesy of Rockefeller University
Twitter changed its "favorite" star icon to a "like" heart icon prompting largely negative responses from Twitter users. But is it the heart they hate? Or the change itself?
Screenshot by NPR
In addition to heart problems triggered by some supplements, emergencies often arise when kids swallow dietary supplements meant for adults, according to the CDC analysis, or when older adults choke on the pills.
Lee Woodgate/Ikon Images/Corbis