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 Where would you find "The Door to Hell"?
 Karakum desert in Turkmenistan: The "door" is a collapsed drilling site in a natural gas field which was set alight over 40 years ago and continues to burn.
 Submitted by Mellony and Peter Maxwell
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 What is "scordatura"?
 Alternative tunings for orchestral string instruments
 Submitted by Hendriette du Plessis
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 What is a "Brannock device"?
 An instrument used to measure the size of your feet, so shoe shopping can be made easier
 Submitted by Graham Crutchley
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 Congratulations to today's winner, Patricia Furstenberg!