Actually the original challenge specifically states: any length or shape of paper. The only restriction is to fold it in half.
What Britney did was unique: she realized this is a problem of limits (the thickness of paper works against you) and worked out a mathematical formula that minimizes this effect.
What Britney did was unique: she realized this is a problem of limits (the thickness of paper works against you) and worked out a mathematical formula that minimizes this effect.