Have you ever wondered just what a bird was chewing on when you saw it incessantly opening and closing its beak? Well some shorebirds, including the Phalarope pictured here, are using surface tension ...
IF an oiled needle be placed on the surface of pure water, it will be supported, but if it be washed in a solution of potash, it will sink. In the first case the effect cannot be due to the ...
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