1. “Heads” side of edge

2. Diameter of human hair 5 meters

4. Human red blood cell Print 3x larger

5. One micrometer (micron)

6. Length of E. coli bacterium

7. Wavelength of red light

8. Wavelength of violet light

9. Orb spider thread Stretching of silk, 1, 5 and 20 times. Measure this thickness

10. Cold virus measure this

11. Gold nanoparticles Measure small particles

12. Carbon nanotube diameter Measure this thickness

13. Nanometer 40 nm between these two lines

14. Water molecules About 65 water molecules between these two lines

15. Atom About 100 typical atoms between these two lines

16. Protons About 50,000 protons between these two lines

17. “Tails” side of edge