Football

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An 1894 series of football trading cards produced by the P.H. Mayo Tobacco company feature Ivy League football stars in their Princeton collegiate sweaters, shown Jan. 8, 2014, at the Metropolitan Museum of Art in New York. The Met is presenting a pop-up exhibition celebrating football’s history through the ages with vintage cards like these. The 150 cards that make up the exhibit are part of approximately 600 from the museum’s vast collection of sport trade cards donated to the Met by the late hobby pioneer Jefferson Burdick. Sunday, Jan. 12, 2014, in New York. The show runs Jan. 24 through Feb. 10. (AP Photo/Kathy Willens)

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This 1894 football card of Harvard's John Dunlop, shown Wednesday, Jan. 8, 2014, is the rarest in a collection of football cards to be shown at the Metropolitan Museum of Art in New York. Collectors regard it as the Honus Wagner of football cards because Dunlop is the only player in the series whose name and school affiliation is missing, and he was only identified a decade ago. The museum is celebrating football’s history through the ages with the vintage trading card exhibition. The 150 cards are among approximately 600 football cards from the museum’s vast collection of sport trade cards donated to the Met by the late hobby pioneer Jefferson Burdick. The exhibit opens Jan. 24 and runs through Feb. 10. (AP Photo/Kathy Willens)

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FILE - In this Jan. 5, 2014 file photo, a fan holds up a weather-related sign during the first half of an NFL wild-card playoff football game between the Green Bay Packers and the San Francisco 49ers, in Green Bay, Wis. Fox Sports will use this weekend's NFC title game in Seattle between the San Francisco 49ers and the Seahawks to test an infrared camera that will show how players' body temperatures change throughout the game. (AP Photo/Jeffrey Phelps, File)

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San Diego Chargers wide receiver Keenan Allen (13) catches a pass for a touchdown against Denver Broncos cornerback Quentin Jammer (23) in the fourth quarter of an NFL AFC division playoff football game, Sunday, Jan. 12, 2014, in Denver. (AP Photo/Charlie Riedel)

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San Diego Chargers wide receiver Keenan Allen (13) and San Diego Chargers running back Danny Woodhead (39) walk off the field after the Chargers lost 24-17 to the Denver Broncos in an NFL AFC division playoff football game, Sunday, Jan. 12, 2014, in Denver. (AP Photo/Joe Mahoney)

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New England Patriots running back LeGarrette Blount (29) heads downfield for a touchdown during the second half of an AFC divisional NFL playoff football game against the Indianapolis Colts in Foxborough, Mass., Saturday, Jan. 11, 2014. (AP Photo/Matt Slocum)

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Denver Broncos quarterback Peyton Manning (18) stretches before playing against the San Diego Chargers in an NFL AFC division playoff football game, Sunday, Jan. 12, 2014, in Denver. (AP Photo/Jack Dempsey)

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New England Patriots running back LeGarrette Blount (29) heads downfield for a touchdown during the second half of an AFC divisional NFL playoff football game against the Indianapolis Colts in Foxborough, Mass., Saturday, Jan. 11, 2014. (AP Photo/Matt Slocum)