-Cats and humans have identical regions in their brain for emotion.
-A cat's brain is more similar to a human's then a dog's.
-The cat's clavicle, or collarbone, does not connect with other bones but is buried in the muscles of the shoulder region.This lack of a functioning collarbone allows them to fit through any opening the size of their head.
-Recent studies show that cats can see green and blue. Though there is a disagreement about the color red.
-Blue eyed, all white cats are often death.
-A cat can't see right under its nose. :33
-Almost 10% of a cat's bones are in its tail.
-The domestic cat is the only species able to hold its tail vertically while walking.
-When a cat is frightened its hair stands up fairly evenly all over their body, when a cat is threatened or ready to attack its hair stands up on a narrow line along its spine and tail.
-Cats dislike citrus scent.
-A cat has 4 rows of 24 whiskers. The top two rows can move independently of the bottom two.
-Cats lap liquid from the underside of their tongue, not the top.
-Cats purr at the same frequency as an idling diesel engine, about 26 cycles per second.
-Domestic cats purr both when exhaling and inhaling.
-Cats walk on their toes. Their front feet have 5 toes, but their back feet have only 4 toes.
-A domestic cat can run at about 31 mph, whereas a human's average speed is 23.4 mph.
-Cats take 20-40 breaths per minute.
-Cat's urine glows under a black light.
-Cat's lose almost as much fluid in saliva while grooming themselves as they do through urination.
-A cat has 2 pair of vocal chords and can make over 100 sounds.
Facts from here.