No piece of normal-size paper can be folded in half more than 7 times.

This popular myth was debunked in 2002 by high school student Britney Gallivan, who successfully folded paper 12 times. She derived a mathematical formula showing that with long enough paper, it can be folded more than 7 times. The key is using very long, thin paper rather than standard letter-size sheets. The limitation is exponential growth in thickness, not an absolute rule.