Richard Knox

Images of the swath of devastation wrought by Typhoon Haiyan in the central Philippines are reminiscent of the tsunami's aftermath in Banda Aceh, Indonesia nearly a decade ago.

And indeed, the World Health Organization grades the great typhoon of 2013 as a Category 3 disaster – its most severe category.

"The scale [of the typhoon's damage] is huge," Dr. Richard Brennan of the World Health Organization tells Shots. "It's monumental. This is one of the biggest emergencies we've dealt with in some time."

Forty-seven-year-old Celeste Corcoran is propped up in her hospital bed. In a nearby window is a forest of blooming white orchids from well-wishers. On the opposite wall, a big banner proclaims "Corcoran Strong."

She's recalling how thrilled she was to be near the finish line of the Boston Marathon, waiting for her sister Carmen Accabo to run by. "I just remember standing there, wanting to be as close as I could to catch her," Corcoran says. "I really just needed to see her face."

U.S. government spending to fight HIV/AIDS in developing countries is also preventing death from other diseases, a new study finds.

Some experts worry the billions of dollars the United States spends to treat people with HIV in poor countries may crowd out prevention and treatment of other illnesses.