Pop Quiz

The Hairy Ball Theorem may be accurately summarized as follows:

a) "Like, if you want me to do that, you need to get waxed just like me!"

b) The scientific explanation for why women tennis players grunt so loudly during serves.

c) There is no nonvanishing continuous tangent vector field on the sphere. Less briefly, if f is a continuous function that assigns a vector in R3 to every point p on a sphere, and for all p the vector f(p) is a tangent direction to the sphere at p, then there is at least one p such that f(p) = 0.

d) The quantity of back hair is inversely proportional to the quantity of ball hair.

Answer.