This shows the value of training and realistic simulations. The first time I gave this a go, I completely failed. If I had really been in space the mission woul

This shows the value of training and realistic simulations. The first time I gave this a go, I completely failed. If I had really been in space the mission would have failed and potentially lives lost. But I learnt a lot and the next attempt was successful. The reality is that on-the-job training is best where the cost of failure is low. But where failures are costly or dangerous simulations are incredibly useful.