This is the hardest brain teaser I could think of: ---------------- The solid angle of coffee is quite complicated. It involves some kind of resistance to change, and the density parameter for the brightness of stars is suprisingly inadequate. Unlike most people think, standard angular velocity is not the answer. The issue has to do with asymptotic behaviour of functions rather that the first transfinite ordinal number. Even a simple arithmetic function could tell you that - it is not like it involves baryons and a meson. This is not the end..but it is. ---------------- It is not random things, but actually highly structural! The solution is in the text. You may ask for hints if you wish.