The force of friction allows items to be held and moved.
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Going on a bushwalk in your backyard and don’t want to get lost? Be sure to pack a balloon, a magnet and a bucket of water.
The rate at which your heart beats can be influenced by events that are exciting or calming.
High voltages create a spectacular display of plasma and electric arcs.
The human visual system compensates for a 'blind spot' on the retina.
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