Graeme Obree and his bike. (Photo:

The setting for Friday's Geo Quiz is Battle Mountain, Nevada. It lies about halfway between Reno, Nevada, and Salt Lake City, Utah. It's where the World Human Powered Speed Challenge is due to take place in September. Cyclists pedal streamlined two wheelers that barely look like bicycles. Scottish cyclist Graeme Obree will be there trying to break the world human-powered land speed record, on his homemade bike. How fast will he have to go to break the record? The answer is: 82.8 miles per hour. Imagine what it's like to ride a bike at that speed! Hear Graeme Obree describe it.

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