Throwing Arm

June 26, 2013 - 1:36 PM
FILE - In this Tuesday, Aug. 7, 2012 file photo made with a multiple exposure, Boston Red Sox's Jon Lester pitches in the third inning of a baseball game against the Texas Rangers in Boston. A new study suggests the ability to throw hard and accurately first appeared in a human ancestor 2 million years ago. (AP Photo/Michael Dwyer, File)