The most common colour for highlighters is yellow because it doesn't leave a shadow on the page when photocopied.
Despite the white, fluffy appearance of polar bears' fur (which is transparent), they actually have black skin.
The bird with the most feathers is the whistling swan, with up to 25,000 feathers. Hummingbirds on the other hand, are so small that they have fewer than 1,000.
The brain takes the longest of any organ to develop and goes through more changes than any other organ in the human body.
Unlike most birds that sing, a woodpecker will drum its beak against a tree. Other woodpeckers can identify which bird it is by the sound of the drumming.
Audrey Hepburn was able to speak English, Spanish, Dutch, Italian and French fluently.
Potato chips were invented after a chef lost his temper with a customer who kept asking for his potatoes to be more fried and thinner.
Cheetahs are extremely fast, however, they tire quickly and can only keep up their top speed for a few minutes before they are too tired to continue.
At Fatburger, you can order a Hypocrite - a veggie burger topped with crispy strips of bacon.
Cleaning a cat's litter box can cause Toxoplasmosis, if the cat is infected.