Yesterday we went to lunch with old university friends who, like us, are retired. They live in Letchworth, which is about an hour away. The husband was the Project Manager of the Rosetta Project during his working life. This successfully orbited an asteroid and landed a probe on the surface. He was interviewed on the TV and made national news recently. He is a very modest fellow, but very bright. He got a 1st in Physics, but you would never believe it. We have been friends for nearly 50 years.