The traffic lights and the 'uncooked' egg

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Please Explain
Dr Karl Kruszelnicki
( http://www.harpercollins.co.in/)

Push button and ‘mobile’ oven

You have pressed the button for the elevator to arrive, or for the pedestrian crossing to clear, but there is always someone next to you trying to speed things along by incessantly jabbing his finger on the button.
Such people believe that by pressing the button frequently and vigorously the elevator or ‘walk’ sign will take less time to appear. Alas, they’re wrong, says Dr Karl Kruszelnicki in Please Explain (http://www.harpercollins.co.in).

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