Vape was chosen as the word of the year for 2014 in part because it provides a window "onto how we define ourselves," says Casper Grathwohl of the Oxford University Press. Here, women exhale vapor clouds during a competition at the Henley Vaporium in Manhattan. Elizabeth Shafiroff/Reuters/Landov hide caption

itoggle caption Elizabeth Shafiroff/Reuters/Landov

After a hard day of bruising battle, ancient gladiators reached for a post-workout drink, according to an ancient account. New research backs that up. Stefano Bianchetti/Corbis hide caption

itoggle caption Stefano Bianchetti/Corbis

This grocery store packet of porcini mushrooms contained a surprise: three species of fungi never before named or described. Bryn Dentinger/Royal Botanical Gardens, Kew hide caption

itoggle caption Bryn Dentinger/Royal Botanical Gardens, Kew