A Porcupine on display during the PBS portion of the 2010 Summer TCA Press Tour at the Beverly Hilton Hotel on August 5, 2010 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
Klemens Torggler's door is an invention based on rotating squares, The special construction makes it possible to move the door sideways without the use of tracks. This technical trick opens up new applications for the door.
Thousands of people were watching the Shoreham Air Show when it turned to horror as a Hawker Hunter plane crashed into a busy bypass, hitting at least four cars – including a wedding limousine.