What’s the maximum number of times that you can fold a piece of paper?

Asked by: Alice Sheridan, Essex

Trying to fold an ordinary sheet of A4 paper suggests that even eight times is impossible: the number of layers doubles each time, and the paper rapidly gets too thick and too small to fold. Such ‘geometric growth’ effects are dramatic: in theory, 26 folds would make the paper thicker than the height of Mount Everest.

The current world paper-folding record belongs to California high school student Britney Gallivan, who in 2002 managed to fold a 1.2km-long piece of tissue paper 12 times.

Read more:

• Why does paper make noise when crumpled?
• Why does paper go yellow over time?

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