I can't stop

"I hate television. I hate it as much as I hate peanuts. But I can't stop eating peanuts."

Orson Welles

Giving it a slight thought (4)

If you name me, I disappear. What am I?

What's so funny? (2)

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 developing a pen that would write in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 3oo ºC. The russian used a (...).
What?