Y> A result in topologY stating that a continuous vector field on a sphere is alwaYs zero somewhere. The name comes from the fact that You can' t flatten all the hair on a hairY ball, like a tennis ball, there will alwaYs be a tuft somewhere (where the tangential projection of the hair is zero). An immediate corollarY to this theorem is that for anYcontinuous map f of the sphere into itself there is a point x such that f(x)=x or f(x) is the antipode of x. Another corollarY is that at anY moment somewhere on the Earth there is no wind. (2002-01-07)