Who
Britney Gallivan
What
12 total number
Where
United States (Ponoma)
When

It was an accepted belief that folding a piece of paper in half more than 8 times was impossible. On 27 January 2002, high school student, Britney Gallivan, of Pomona, California, USA, folded a single piece of paper in half 12 times and was the first person to fold a single piece paper in half 9, 10, 11, and 12 times. The tissue paper used was 4,000 ft (1,219 m; 0.75 miles) long.

In preparation for the challenge, Gallivan identified criteria for folding and the phenomenon that ultimately limits the geometric folding progression. She derived mathematical equations for single direction – L=πt/6(2ⁿ+4)(2ⁿ-1) – and alternate direction – W=πt23(ⁿ-1)/2 – folding. The equations establish the relationship between the length of paper required (L), the thickness of the paper (t), the minimum possible width of square material (W), and the number of possible folds (n). It is documented in her book How to Fold Paper in Half Twelve Times.