The British have long said, "Keep calm and carry on." But the catchphrase may need an update for health care. Keepcalm-o-matic.co.uk hide caption

itoggle caption Keepcalm-o-matic.co.uk

A well-traveled root: A vendor sells sweet potatoes at a market near Manila in 2011. The Portuguese brought the root to the Philippines all the way from the Caribbean. Ted Aljibe/AFP/Getty Images hide caption

itoggle caption Ted Aljibe/AFP/Getty Images

A copper engraving from 1656 shows a plague doctor in Rome wearing a protective suit and a mask. Artwork by Paul Furst /Wikimedia.org hide caption

itoggle caption Artwork by Paul Furst /Wikimedia.org

Microbiologist Emma Allen-Vercoe invented the Robogut, a mechanical device that mimics conditions in the human colon. Courtesy of thestar.com hide caption

itoggle caption Courtesy of thestar.com

You'd need a lot of these — think in terms of railroad cars to haul them — to have $1 trillion. Shannon Stapleton /Reuters /Landov hide caption

itoggle caption Shannon Stapleton /Reuters /Landov

Don't blame the braised eggplant. Two people reportedly poisoned a Beijing restaurant's eggplant dishes, similar to the one shown here, in an attempt to boost the business of a rival eatery. yoppy/Flickr.com hide caption

itoggle caption yoppy/Flickr.com

Chiara Andolina, a malaria researcher in Thailand, feeds her mosquito colony by letting the insects bite her right arm. These mosquitoes are picky and will dine only on live human blood. Ben de la Cruz/NPR hide caption

itoggle caption Ben de la Cruz/NPR