AdvertisementHow Do They Know Those Sprinters Finished In A Dead Heat?June 26, 2012Mark MemmottfacebookEmailIn this handout photo provided by the USATF, Jeneba Tarmoh (bottom, lane 1) and Allyson Felix cross the finish line at exactly the same time in the women's 100 meter dash final during Day Two of the 2012 U.S. Olympic Track & Field Team Trials at Hayward Field on Saturday in Eugene, Ore. It's their torsos, not head, hands, feet or arms, that matter. (Getty Images)