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I remember seeing the trick on Tomorrow's World (a UK science TV programme) back in the 90s. Can't find a link to the particular episode though.

• lowlevel 8y ago
  I was doing this in the mid eighties... think a teacher showed me it but can't remember... didn't have tv.
  • schoen 8y ago
    I'm pretty sure I saw it featured in an article in Highlights for Children during the 80s. https://en.wikipedia.org/wiki/Highlights_for_Children https://en.wikipedia.org/wiki/Highlights_for_Children
    • AluminiumPoint 8y ago
      I learned it in australia many years ago from these guys: https://www.youtube.com/watch?v=DYBw7k_8EbE https://www.youtube.com/watch?v=DYBw7k_8EbE
      • schoen 8y ago
        Do Australians commonly say "elephant" to count seconds as the presenters do? In the U.S. it's usually "one-thousand" or "Mississippi". (I guess I can imagine that Australians wouldn't say "Mississippi"!)
        • JoeAltmaier 8y ago
          or 'chimpanzee'!
        • yesenadam 8y ago
          I've never heard of "elephant", no. (Sydney here)