Health worker Jackie Carnegie delivers a rubella vaccine in Colorado in 1972. Ira Gay Sealy/Denver Post via Getty Images hide caption
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Thursday
NASA Spacecraft Crashes Into Mercury, Concluding 4-Year Study Of Planet
Chipotle restaurant workers in Miami fill orders on April 27, the day the company said it would use only non-GMO ingredients in its food. Joe Raedle/Getty Images hide caption
St. Agnes Hospital in Baltimore is one of the 131 hospitals run by Ascension Health. It's a not-for-profit, Catholic health care system that treats many low-income patients. St. Agnes Hospital hide caption
Rod-shaped specimens of Yersinia pestis, the bacterial cause of plague, find a happy home here in the foregut of a flea. Fleas can transmit the infection to animals and people, who can get pneumonic plague and transmit the infection through a cough or kiss. Science Source hide caption
Algy Garrod's rapeseed in bloom in Norfolk, England. Anne Bramley for NPR hide caption
This image of a "red spot" on Mercury, which is thought to be the result of a volcanic explosion, was sent to Earth by the Messenger probe in 2011. NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington hide caption
Dr. George Papanicolaou discovered that it was possible to detect cancer by inspecting cervical cells. The Pap smear, the cervical cancer screening test, is named after him. American Cancer Society/AP hide caption
A surgeon and nurse anesthetist a baby by emergency cesarean section at a hospital in Rwanda. Amber Lucero Dwyer/Courtesy Lifebox Foundation hide caption
Wednesday
An artist's rendition of the HD 7924 planetary system — just 54 light-years away from Earth — shows newly discovered exoplanets c and d, which join Planet b. Karen Termaura, BJ Fulton/UH IfA hide caption
Florida state Senate president Andy Gardiner, R-Orlando, was applauded by his fellow senators Tuesday, after expressing his disappointment with the Florida House for ending its session three days early, instead of working through the budget clash. Steve Cannon/AP hide caption
Florida's House Quits Early, At Impasse Over Medicaid Expansion
Tuesday
Graze the Roof is a community-produced garden that grows vegetables on the rooftop of a church in San Francisco. Sergio Ruiz/Flickr hide caption
Monday
A man stands near collapsed houses in Bhaktapur, on the outskirts of Kathmandu, on April 27, two days after a magnitude-7.8 earthquake hit Nepal. Aftershocks tend to get less frequent with time, scientists say, but not necessarily gentler. Prakash Mathema/AFP/Getty Images hide caption
For all the good aspirin can do in preventing second heart attacks and strokes, taking it daily can boost some risks, too — of ulcers, for example, and of bleeding in the brain or gut. iStockphoto hide caption