Russian Joke: pen vs pencil

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity. To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300 C.
The Russians used a pencil.

Math Jokes

MATHS Teacher :"How can you distribute 8 apples
among 6 people equally....??"

Student: "By Making Juice"