Britney Gallivan Britney Gallivan Britney Crystal Gallivan (born 1985) of Pomona, California, is best known for determining the maximum number of times that paper or other materials can be folded in half. In January 2002, while a junior in high school, Gallivan demonstrated that a single piece of toilet paper 4000 ft (1200 m) in length can be folded in half twelve times. This was contrary to the popular conception that the maximum number of times any piece of paper could be folded in half was seven. She calculated that, instead of folding in half every other direction, the least volume of
Folded-t and half-t distributions Folded-t and half-t distributions In statistics, the folded-"t" and half-"t" distributions are derived from Student's "t"-distribution by taking the absolute values of variates. This is analogous to the folded-normal and the half-normal statistical distributions being derived from the normal distribution. The folded non-standardized "t" distribution is the distribution of the absolute value of the non-standardized "t" distribution with formula_1 degrees of freedom; its probability density function is given by: The half-"t" distribution results as the special case of formula_3, and the standardized version as the special case of formula_4. Folded-"t" and half-"t" generalize the folded normal and half-normal distributions by