SpaceX set for crew demo launch

The US is about to take a major step towards being able to fly its astronauts into space once again. California's SpaceX firm is performing a demonstration of a new rocket and capsule system, which, if it works well, will be approved to carry people. Routine crew missions to the space station could start later this year. Not since the retirement of the shuttles in 2011 has America been able to put humans in orbit. It's had to pay to use Russian Soyuz vehicles instead.