A jiffy is an actual unit of time for 1/100th of a second. Thus the saying, I will be there in a jiffy.
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To get a song out of your head, try doing something like a puzzle or Sudoku.
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Passengers on the Beijing subway can pay with plastic bottles.
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You can tape a small mirror onto a cone speaker, play music and shine a laser on to the mirror and the reflection will look like a laser light show on your wall.
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There are more nerve cells in the human brain than there are stars in the Milky Way.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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