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Two color blocks, nearly identical. Click where one turns into the other. Forty rounds later you get a number for how good your eyes are, and a few excuses about your monitor.
★The Mona Lisa has no eyebrows or eyelashes.★Most 'silver' spoons are actually made of stainless steel.★A rhinoceros' horn is made of keratin, the same stuff as hair.★A bolt of lightning is five times hotter than the surface of the sun.★The French language has 13 different words for 'kiss'.★Rats laugh when tickled.★The dot over the letter 'i' is called a tittle.★The human brain uses about 20% of the body's total energy.★Cleopatra lived closer in time to the Moon landing than to the building of the Great Pyramid.★Banging your head against a wall for one hour burns 150 calories.★More than half of all people alive today have never made a phone call.★Hippos can't actually swim, they walk along the riverbed.★In Switzerland it is illegal to own just one guinea pig.★Cashews grow on the outside of a fruit, not inside a shell.★Hot water freezes faster than cold water. This is called the Mpemba effect.★A flock of crows is known as a murder.★There are more possible iterations of a game of chess than atoms in the observable universe.★The fear of long words is ironically called hippopotomonstrosesquippedaliophobia.★Cats can't taste sweetness.★Voice actors for Mickey and Minnie Mouse got married in real life.
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