Wind direction is measured in the direction the wind is coming from.
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Make a toy that refuses to be pushed around and always comes back for more.
Take the plug out of the bath and watch how the water moves as it goes down the plughole.
Polarising filters can be used to block or transfer light waves at different angles.
The minimum number of moves required to solve a Tower of Brahma puzzle depends on the number of discs being used.
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