A Generalization in Space of Jung's Theorem
  Let's have $n$ points in the space such that the maximum distance between any of them is $a$. We prove that there exists a sphere of radius $r \leq a \frac{\sqrt(6)}{4}$ that contains in its interior or on its surface all these points. [This is a generalization of Jung's theorem that he designed for a plane.] 
Florentin Smarandache