As I’m busy elsewhere, I’m afraid you’ll have to throw together your own pile of links in the comments. After nine years of Fridays I’m sure you know what to do. Indulge yourselves. I’ll set the ball rolling with an attempt to melt pennies with sunlight, some self-tightening trainers, a submarine surfacing in the Arctic Circle, the magnetic suit buttons you’ve always wanted but could only dream of, and an impressive display by Mr Smooth. 

Play nicely. I’ll be checking in later.