Mountain bikers are known to be tough. Few, if any, are tougher than South African Evan van der Spuy. The 17-year-old was blind-sided by a Red Hartebeest, a large antelope that can weigh up to 330 pounds, during a ride this week. Amazingly, he wrote on twitter: &ldquo;I&rsquo;m all stable with nothing more than a [...]