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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!