I once read in a physics textbook that if an atom were to be magnified to the size of London’s Wembley Stadium, the nucleus at the centre would be about as big as a hazelnut. Well screw that, because I can think of much better uses for Wembley Stadium. Besides the obvious — football — it is of course an ideal venue for rock concerts and last Friday night U2 showed exactly how it should be done.

There is something inherently confessional in a blog, even in a science blog. There is an urge to reveal—do you feel it?—that is normally kept safely in check. Mine is pretty well locked down. And yet I admire those who, on occasion, have cast off their reins and opened their hearts with great honesty. I think particularly of Richard’s pieces on “depression” and, more recently, faith.