When I played in the garden as a small child I used to imagine there were tiny creatures living in the moss on the stone wall. Today I saw this amazing picture of a real live one - on the NASA picture of the day site, of all places. It's called a Tardigrade (and as someone who's always last off the train I warm to that name), a Waterbear or a Moss Piglet. My world has been made bigger by this minuscule fellow-creature. And apparently it wouldn't have needed the Ark to survive!