In this May 20, 2013 photo, David Hillis, a University of Texas geneticist and biologist, stands at his Double Helix Ranch near Pontotoc, Texas. Hillis and doctoral student Emily Jane McTavish, along ... more 
In this May 20, 2013 photo, David Hillis, a University of Texas geneticist and biologist, stands at his Double Helix Ranch near Pontotoc, Texas. Hillis and doctoral student Emily Jane McTavish, along with scientists from the University of Missouri-Columbia, conducted research showing Longhorns developed from cattle thousands of years ago in India and Pakistan and from cattle from Europe that bred in Africa and adapted to dry and hot conditions that make them ideal for Texas and the Southwest. The research also confirms Longhorns are direct descendants of cattle brought by Christopher Columbus in his second voyage to the New World in 1493. (AP Photo/Michael Graczyk). less 
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Associated Press | Photo By Michael Graczyk
Sun, May 26, 2013 11:45 AM EDT