A computer designed by hobbyists to look like a brain on display at a Berlin fair in 2012. What happens when we go from crude models to complete working simulations of this all-important organ? Britta Pedersen/DPA/AFP/Getty Images hide caption

itoggle caption Britta Pedersen/DPA/AFP/Getty Images

Electronic cigarettes are actually battery operated devices that use a heating element to atomize a flavored liquid, typically containing nicotine, so that it can be inhaled. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Ukrainian skier Bogdana Matsotska decided not to compete in Friday's slalom race, in a show of solidarity with protesters in Kiev. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images