Monday, February 25, 2008

magnetized needle

Cradled in a couple pieces of thread, a magnetized needle can be slowly lowered onto the surface of a cup of water, and will actually float there due to the surface-tension. Drop the ends of the thread and the needle will turn to align north-south.
Hiking high in the mountains can make you very hot. There are often snow banks that persist through summer above 12,000 feet, so why not use them to cool off. Rub that snow on your arms and put some on your head. The real point here is to lessen your need to sweat, so you can make your drinking water last longer.

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