'Einstein' probe heads into space

This is a huge amount of money to spend – but it might well be worth it. I am looking forward to the results – my bet is on Einstein being right.

I do remember on Carl Sagan’s excellent Cosmos series that an experiment was performed on how time slows down as you move. An atomic clock was placed on the ground, and synchronised with another on a 747, which then flew for a certain distance at a speed that planes do. On return it was found that there was a discrepancy – when you fly on planes you are relatively becoming slightly younger.