People around the world spend an estimated 3 billion hours playing computer games every week. That might seem like a colossal waste of time, but scientists are starting to harness some of that effort to solve vexing problems in biology. Take, for example, a game developed by a pair of scientists in Canada.This podcast was produced by Sam Eaton for NOVA and PRI's "The World."For more global environmental stories, visit:http://www.pbs.org/wgbh/nova/earth/http://www.theworld.org/category/topics/environment/Funding for NOVA is provided by David H. Koch, the Corporation for Public Broadcasting, and PBS viewers.