Another historic day for SpaceX

A SpaceX Dragon Capsule carrying four astronauts from three countries docked with the International Space Station early Saturday morning.  The astronauts took off from the Kennedy Space Center in Florida Friday morning.  The spacecraft travelled an incredible 17-thousand miles per hour.  This is also the first crew to make use of a previously flown, privately-owned rocket booster and spacecraft.  The astronauts will spend six months on the I-S-S studying living models of human organs. NASA says the research will advance the development of drugs and vaccines.