Famous astronauts Mark and Scott Kelley are identical twins, and part of an ambitious experiment. Scientists studied Mark on Earth, while Scott lived in space for more than 340 days, and the results are surprising. Then, emails between RTD and the Federal Railroad Administration show a troubled relationship with the Train to the Plane. Plus, snowmobiler Colten Moore suffered a spinal cord injury at last month's X Games. His brother Caleb died after a similar accident in 2013.
