The regulation of medical devices bears a passing resemblance to this giant version of the Rube Goldberg-style game Mouse Trap. Bill Ward/Flickr hide caption

itoggle caption Bill Ward/Flickr

Doctors perform a kidney transplant operation in Spain in 2010. One in three people with kidney failure has antibodies that make it hard to receive a transplant, but a new treatment can get rid of them prior to transplant. Xurxo Lobato/Cover/Getty Images hide caption

itoggle caption Xurxo Lobato/Cover/Getty Images

Most gases used in anesthesiology eventually end up in the atmosphere where they trap heat even more effectively than carbon dioxide. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A CT scan of the brain shows the cerebellum, a small portion of each temporal lobe, and the sinuses. Andrew Ciscel via Wikimedia Commons hide caption

itoggle caption Andrew Ciscel via Wikimedia Commons