Auge
6 cards from across every topic, each citing a source. Tap one to open it in the feed.
- After 40 your arms seem to get too short.
Over the years the eye's lens loses elasticity and hardens, and the ciliary muscle weakens too. Focusing power for near …
- At night you only see faint stars if you look away.
Your retina carries about 120 million rods for dim light and some 6 million cones for colour and detail. In the fovea …
- Each eye is missing a patch of image, and you never notice.
Where the optic nerve leaves the retina there are no light-sensing cells. This blind spot sits about 15 degrees to the …
- Roughly one man in twelve mixes up red and green.
Red-green colour blindness affects about 8 percent of men and around 0.5 percent of women of Northern European descent. …
- The onion isn't crying. It's shooting.
An intact onion doesn't sting. Only your knife breaks cell walls, letting two separately stored substances meet: an …
- You're blind for hours every day without noticing.
Your eyes jump about 3 times a second in rapid movements called saccades. During each jump, lasting 20 to 200 …