The number of new drug shortages each year in the U.S., from 2001 through Dec. 21, 2012. University of Utah hide caption

itoggle caption University of Utah

Brain scans using Amyvid dye to highlight beta-amyloid plaques in the brain. Clockwise from top left: a cognitively normal subject; an amyloid-positive patient with Alzheimer's disease; a patient with mild cognitive impairment who progressed to dementia during a study; and a patient with mild cognitive impairment. Slide courtesy of the journal Neurology hide caption

itoggle caption Slide courtesy of the journal Neurology

For centuries, Russians believed putting a brown frog in their milk would keep it fresh. Now scientists are finding chemicals in the frog's slimy goo that inhibit the growth of bacteria and fungi. Stefan Arendt/Corbis hide caption

itoggle caption Stefan Arendt/Corbis

Drama ensues when doctors work to save patients bleeding from traumatic injuries. Ian Roberts hide caption

itoggle caption Ian Roberts

Grapefruit can make for a tasty addition to breakfast. But it can also interfere with some medications. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Currently, you need a doctor's prescription to purchase emergency contraception, such as Plan B, if you are under 17. AP hide caption

itoggle caption AP

A controversial pilot project reduced the cost of the most effective malaria drugs by giving manufacturers, such as Guilin Pharmaceutical in China, subsidies. Frederic J. Brown/AFP/Getty Images hide caption

itoggle caption Frederic J. Brown/AFP/Getty Images

Blood samples dry during malaria screening. Public health workers call for more malaria testing in Africa to stop costly drugs from being handed out to kids with pneumonia. Paula Bronstein/Getty Images hide caption

itoggle caption Paula Bronstein/Getty Images

Dr. Esther Dalizu holds a pack of Coartem Malaria drugs in a pharmacy in Nairobi, Kenya, last year. Sayyid Azim/AP hide caption

itoggle caption Sayyid Azim/AP

Under the microscope, Mycobacterium tuberculosis bacteria. The germs that cause TB have become resistant to many drugs. Janice Haney Carr/CDC hide caption

itoggle caption Janice Haney Carr/CDC