Swimming pool trivia:Why do you need to shower before entering the swimming pool?

Swimming pool trivia:Why do you need to shower before entering the swimming pool?

If you do not shower first to wash your body directly into the pool, then on average each…
Cosmic trivia:What was the universe before the big bang?

Cosmic trivia:What was the universe before the big bang?

It is hard to imagine what the universe looked like 13.7 billion years ago. At that time, the…