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Nelson got a new skateboard. He had only practiced for two days. All his friends already knew how to do tricks. Nelson was very impatient. He wanted to do tricks like everyone else. Nelson decided to try to jump down a set of stairs. "Don't do it!" said his best friend. "It can't be that hard," Nelson insisted. "Tony Hawk makes it look easy. One minute later, Nelson was flying three feet above the ground. He felt like he was flying in slow motion. Suddenly, he slammed into the concrete. Everythi