Visitors to the new National Museum of Mathematics try out an interactive exhibit in New York, Monday, Dec. 17, 2012. The museum is aimed at kids aged 8 to 13, and curators have given the place a playground feel. The 40 exhibits include a "wall of fire" made up of laser lights that teaches kids about geometry and a square-wheeled tricycle that still manages to produce a smooth ride thanks to a wavy track. (AP Photo/Seth Wenig)

Associated Press
Visitors to the new National Museum of Mathematics try out an interactive exhibit in New York, Monday, Dec. 17, 2012. The museum is aimed at kids aged 8 to 13, and curators have given the place a playground feel. The 40 exhibits include a "wall of fire" made up of laser lights that teaches kids about geometry and a square-wheeled tricycle that still manages to produce a smooth ride thanks to a wavy track. (AP Photo/Seth Wenig)
Visitors to the new National Museum of Mathematics try out an interactive exhibit in New York, Monday, Dec. 17, 2012. The museum is aimed at kids aged 8 to 13, and curators have given the place a playground feel. The 40 exhibits include a "wall of fire" made up of laser lights that teaches kids about geometry and a square-wheeled tricycle that still manages to produce a smooth ride thanks to a wavy track. (AP Photo/Seth Wenig)
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