Her name is Britney Crystal Gallivan, and she is famous for determining the maximum number of times materials like paper can be folded in half. Back in 2002, while she was a junior in high school, Gallivan demonstrated that a 4000 ft piece of toilet paper can be folded in half twelve times.
The popular belief at the time was that the maximum number of times a paper could be folded in half was seven (something many still think to be true). She calculated that instead of folding in half alternating directions, the least volume of paper to get 12 folds would be to fold in the same direction with a long sheet of paper.
To demonstrate, she used a brand of toilet paper that's $85 per roll. Additionally, she derived an equation that yielded the dimensions of a piece of paper necessary to fold it a certain number of times.
For one long strip of paper where L represents length, t represents thickness, and n represents number of folds desired, the equation is as follows: L = (πt/6)(2^n + 4) (2^n-1). Basically, what this means is that in order to fold paper in half, the paper must be π times longer than its thickness.