Thanks to *Used Math* by Clifford Schwartz

- How many golf balls will fit in a suitcase?
- How many piano tuners are there in Chicago?
- How many cells are there in a human body?
- How many hairs are there on a human head?
- How many individual frames are needed for a feature length motion picture?
- What is the ratio of spacing between gas molecules to molecular diameter in a gas at standard temperature and pressure?
- How many seconds are there in a year?
- If your life earnings were doled out to you by the hour, how much is your time worth per hour?
- What is the weight of solid garbage thrown away by American families each year?
- How many molecules are in a standard classroom?