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1. 10²⁵ m a ripple from space
2. 12,700 km the whole atmosphere
3. 2,000 km a subcontinent’s rains
4. 1 km a computing campus
5. 100 m a field
6. 10 m a classroom
7. 1 m two people talking
8. 30 cm the laptop in front of you
9. 12 cm a human heart
10. 8 cm an item in a robot’s grip
11. 3 cm a carved letter
12. 12 mm what imaging finds
13. 10 µm a bacterial micro-colony
14. 10 nm one protein

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