FACTUAL RIDDLES XXXI

1. When it comes to belly buttons, what is the percentage of innies to outies?
2. What is the only metal that doesn't rust?
3. How many nanoseconds are there in a minute?
4. What's a geophasiac?
5. What is meant by the phrase HOI POLLOI?

Answers:

1. Innies - 90% 
2. Gold
3. Sixty billion 
4. A person who eats dirt
5. The masses - everyday people