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Research shows high-level chess players can burn hundreds of calories while competing. We talk to grandmaster Maurice Ashley about why the game needs brains, and brawn.

IMAGE DISTRIBUTED FOR SUBWAY - Anthony Barr, 2014 draft prospect and newest SUBWAY Famous Fan, unveils a life-size food statue made of fresh vegetables, Wednesday, May 7, 2014, in New York. Barr

Ohio State tailback Maurice Clarett runs to the end zone against Washington State Saturday, Sept. 14, 2002, in Columbus, Ohio. The NCAA has investigated a police report filed byClarett about cash and thousands of dollars of stereo equipment stolen from a

Mexico's goalkeeper Luis Michel (12) rolls the ball to a teammate against Iceland during first-half action at Bank of America Stadium in Charlotte, North Carolina, Wednesday, March 24, 2010. (Photo by David

1950 Bowman #234B Bobby Shantz Philadelphia Athletics COR: Copyright (COR: Copyright line on back)(Marks on card front) MLB Baseball Card (RC - Rookie Card) VG/EX Very Good/Excellent : Collectibles & Fine

FILE - This undated combination of file photos from wanted posters released by the U.S. Marshals Service shows Pedro Flores, left, and his twin brother, Margarito Flores. On Tuesday, Jan. 27, 2015

A Burmese Police Guard at Mandalay. 'Burmah. A series of one hundred photographs illustrating incidents connected with the British Expeditionary Force to that country, from the embarkation at Madras, 1st Nov, 1885

NO FILM, NO VIDEO, NO TV, NO DOCUMENTARY - At the World Trade Centere site, footprints of the North Tower, foreground, and South Tower, background, of the World Trade Center, will have

Calvin Jumping Bull on Wednesday, June 8, 2005, at Oglala, S.D., describes the events of June 26, 1975 at his family's ranch on the southwest corner of the Pine Ridge Indian Reservation.

Investigators from Virginia State Police and Metropolitan Police Department look for the remains of Pamela Butler along the I-95 express lanes between Garrisonville and Quantico in Stafford, Va. on Friday, Dec. 8