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  • Denver resident Alli Deitz displays her sign as rooftop onlookers cheer on the crowd on Saturday, Jan. 21 at the Women's March on Denver.

  • A group plays ultimate frisbee in Redwall Cavern in Marble Canyon on Tuesday, Sept. 13, 2016.

  • An Adaptive Sports Center ski instructor encourages her student on Sunday, Jan. 18, 2015 at Mt. Crested Butte Ski Area in Colorado. (marketing)

  • Digger, an avalanche rescue dog, finds volunteers hidden in a snow cave as part of his training on Thursday, Feb. 28, 2013 at Red River Ski Area in Red River, New Mexico. The two-year old Lab has progressed to the final level of training, in which he finds two people hidden in separate caves.

  • Hummingbirds zoom around Program Counselor Michaela Levine on Monday, July 15, 2013 at the Indian Writings Staff Camp of Philmont Scout Ranch in Cimarron, NM.

  • A member of the Los Angeles Veterans Association scales a wall of ice on Thursday, Jan. 8, 2015 in Lake City, Colo. The group was working with the Crested Butte Adaptive Sports Center, which facilitates outdoor sports for people with disabilities. (marketing)

  • Steph Foley and Bess Frissell serenade cyclists on the MKT Trail as they near the finish line of the 2011 Boone Dawdle in Rocheport, Mo. Several other musicians, known as "buskers," were staggered along the trail to entertain riders.

  • University of Illinois Chicago freshman Jacob McNamara is safe at first base as University of Missouri sophomore Scott Sommerfeld prepares for the catch during the game on Sunday, March 6, 2011. Missouri lost 5-1.

  • Craig Franklin topples into Stephens Lake during the Polar Plunge in Columbia, Mo. on Saturday, Feb. 19, 2011, leading the rest of his team, who are dressed as mice. Franklin and his team, a group from the Research Animal Diagnostic Laboratory, raised almost $1,500 for charity.

  • A man fishes on the east fork of the Black River near McNary, Ariz. on July, 3, 2010.

  • “The Devil’s Icebox” is the nickname of an underground cave that was formed by karst processes under Flat Branch Creek in Rock Bridge Memorial State Park in Columbia, MO. The small amount of sunlight that filters into the Icebox landed on Jane Monaghan and Taylor Chandler.

  • University of Missouri junior Allie Heizelman spins through the air during a floor exercise in the meet against Nebraska on Friday, Feb. 4, 2011.