- 1 second is 1 second
- 1 million seconds is 12 days (a vacation)
- 1 billion seconds is 30 years (a career)
- 1 trillion seconds is 30,000 years (longer than human civilization)
- 1 millimiter is 1 mm (pretty tiny)
- 1 million mm is a kilometer (down the street)
- 1 billion mm is a 1000 km (600 miles — partway across the country)
- 1 trillion mm is 1,000,000 km (Going around the world 25 times, almost as wide as the Sun)