I’ve been in Twiter contact with Commander Chris Hadfield who is currently orbiting the Earth,…

And – if you have a moment – here is a nice movie of the…

[See LETTERS] You know Ian … I am not really a conventional Scientist … so…

Replying to feedback in LETTERS: This means a lot to me. You’re right to question…

Hey – this is nice and comforting. The chances of getting hit by a natural…

Here is the text of my talk [at Starmus]… at least this is what I…