“Heads” side of edge

Diameter of human hair 5 meters

Human red blood cell Print 3x larger

One micrometer (micron)

Length of E. coli bacterium

Wavelength of red light

Wavelength of violet light

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

Cold virus measure this

Gold nanoparticles Measure small particles

Carbon nanotube diameter Measure this thickness

Nanometer 40 nm between these two lines

Water molecules About 65 water molecules between these two lines

Atom About 100 typical atoms between these two lines

Protons About 50,000 protons between these two lines

“Tails” side of edge