TDN Rising Star' Always A Runner (Gun Runner) won under the lights at Churchill Downs in the GI Kentucky Oaks.

Take a group of runners circling a track at unique, constant paces. Answering the question of how many will always end up running alone, no matter their speed, has vexed mathematicians for decades.

Runners are packing the streets on Patriots' Day for the signature Boston Marathon on Monday. Hundreds of thousands of spectators are lining the iconic 26.2-mile route from Hopkinton to Boston. In ...