51 favourite facts you’ve always believed that are actually false

The proportion of the brain “firing” at any one time is task dependent, but ultimately, every region is used almost every day.

These were never medieval torture devices, but 18th-century fakes were created for sensational circuses.

Only in infants is most heat lost through the head (unless the head is the only uncovered part of the body).

They’ll be really confused, but it’s OK. They’re more likely to hurt themselves if they’re not awoken.

Actually, they grow on massive herbs that just resemble trees.

Nope, it doesn’t. There’s no need to avoid dairy if you have a cold.

Not only can bats see, but they also use echolocation.

Not really. The diuretic effect of caffeine is offset by the amount of water in a caffeinated drink.

While not the smartest creatures, goldfish boast a memory span of three months.

Regrown hair isn’t thicker, coarser, or darker; it just appears so because it grows back with a blunt tip.