130,000,000 

Photo-receptor (light receiving) cells.

6,000,000

Cones handle all colour vision and are able to distinguish

8,000,000 

different shades of colour.

124,000,000

Rods can detect and distinguish a single photon of light.

Billions of photons of light strike your retina every second.

16,000 

Hair cells in your inner ear that respond faster than any other cell in your body.

Each hair will trigger if you move the tip by as little as the width of an atom.

When listening to high notes in classical music, your hair cells fire at

20,000

times per second.

5,000,000 

Olfactory receptors, each one has its own gene.

1,000

Giant protein molecules are used by your receptors to decode smell.

Your nose can detect 

10,000 

different odours.