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What slope minimum exists for a standard bicycle driven by a standard person on a no-wind day, riding on regular bike tires on regular asphalt, so that the bicycle still manages to roll? Two degrees? Less? More? I suppose one would need to know the C.O.F. between a bike tire and asphalt! Anyone...

I have a 97 Buick Park Avenue which had its rear, wheel hub/center cap pilfered. Where in Canada can I get a used one? The cap is chrome and has a 6 and 1/2 inch diameter. Where to get one used for less than the cost of a set of my limbs? Arm and a leg indeed! Brand new is over 150 bucks!!!

Guy goes to a doctor and says, "It hurts when I do this." The doctor says, "Well don't do that."

Could the ubiquitous home computer, in conjunction with "plug-in" medical testing devices lessen the skyrocketing cost of medical care? The home computer could communicate with the doctor's computer and call for more comprehensive testing -- if required. What are some devices that could be...

What are some (astronomy related) erroneous assertions you have come across? One recurrent myth I hear a lot is that (the) "North Star is the brightest star..." What myths have you encountered?

Awaiting an ISS flyby at 22:19 (EST), I, instead, witnessed two bright flashes near the zenith. The flashes were far brighter than anything else in the sky -- like a photographer's flash in the sky. There were no Iridium flares listed for this time, and so I wonder what these flashes were. They...