Sis den summer arc

Sweden's Volvo made the three-point seatbelt design patent open and available to other car manufacturers for free, in the interest of safety. It saves one life every 6 minutes.

Written by Icelandic composer Jón Leifs in 1964, the piece called Hekla, Op 52, requires four sets of rocks hit with hammers, steel plates, anvils, sirens, cannons and metal chains to play.