Avian influenza, or bird flu, causes an infectious and contagious respiratory disease. In the lab, several scientists have made the H5N1 strain more contagious, a controversial line of research. James Cavallini/ScienceSource hide caption

itoggle caption James Cavallini/ScienceSource

When people see charts like this, they think the drug is more effective than if they just read about the data, a study finds. Source: Cornell University hide caption

itoggle caption Source: Cornell University

A doctor uses a microscrope to view a human egg during in vitro fertilization (IVF), which is used to fertilize eggs that have been frozen. Mauro Fermariello/ScienceSource hide caption

itoggle caption Mauro Fermariello/ScienceSource

An ambulance carrying Amber Vinson, the second health care worker to be diagnosed with Ebola in Texas, arrives at Emory University Hospital in Atlanta on Wednesday. David Tulis/AP hide caption

itoggle caption David Tulis/AP

A man walks past the former site of a clinic that offered abortions in El Paso, Texas. Juan Carlos Llorca/AP hide caption

itoggle caption Juan Carlos Llorca/AP

Jennifer Doudna and her colleagues found an enzyme in bacteria that makes editing DNA in animal cells much easier. Cailey Cotner/UC Berkeley hide caption

itoggle caption Cailey Cotner/UC Berkeley

The newly approved Harvoni tablets bring several advances to the fight against hepatitis C, but they also have a steep price tag, reported at $1,125 for a single dose. Gilead Sciences hide caption

itoggle caption Gilead Sciences

Joseph Robert gets a flu shot at the Metropolitan Multi-Service Center in Houston during the Falls and Flu Prevention Day, sponsored by the National Council on Aging and Sanofi Pasteur, on Sept. 26, 2013. Aaron M. Sprecher/AP Images for National Council on Aging and Sanofi Pasteur hide caption

itoggle caption Aaron M. Sprecher/AP Images for National Council on Aging and Sanofi Pasteur

Children's Mercy Hospital in Kansas City, Mo., was the first to report a surge of children with serious respiratory illness in August. Andy Pollard/Children's Mercy Kansas City hide caption

itoggle caption Andy Pollard/Children's Mercy Kansas City

Insulin is produced by the green cells that are in clusters about the same size as the islets in the human pancreas. The red cells are producing another metabolic hormone, glucagon, that prevents low blood sugar. Harvard University hide caption

itoggle caption Harvard University

Joe Kiani, addresses the second-annual Patient Safety, Science & Technology Summit in January 2014. Courtesy of the Patient Safety Movement Foundation hide caption

itoggle caption Courtesy of the Patient Safety Movement Foundation

Photos from Liz Paul's blog entries on Prior Fat Girl. The blog chronicles women's weight loss journeys. Courtesy of Liz Paul/PriorFatGirl.com hide caption

itoggle caption Courtesy of Liz Paul/PriorFatGirl.com

Carlos Romero and girlfriend Kate Rowe sit down for a meal they cooked together. Two years ago, Carlos Romero weighed 437 pounds. Mike Kane for NPR hide caption

itoggle caption Mike Kane for NPR