In a cluster of glowing human stem cells, one cell divides. The cell membrane is shown in purple, while DNA in the dividing nucleus is blue. The white fibers linking the nucleus are spindles, which aid in cell division.
Allen Institute for Cell Science
Rep. Diana DeGette, D-Colo., and Rep. Fred Upton (right), R-Mich., who have spearheaded the 21st Century Cures Act, speak after a 2015 House of Representatives vote in its favor.
Congressional Quarterly/CQ-Roll Call, Inc./Getty Images
When Georgia Moore (second from left) was diagnosed with leukemia in 2010, her parents, Trevor and Courtney Moore, worried about the germs her younger sister, Ivy, would bring home from school.
Courtesy of the Moore family/Kaiser Health News
The skin of the golden poison dart frog, Phyllobates terribilis, secretes a deadly poison that might lead to a better understanding of how to treat malfunctions of the human nervous system.
Tambako the Jaguar/Getty Images