Biggest, fastest, strongest, longest

Can a crocodile stick its tongue out.?

Wearing headphones for just an hour could increase the bacteria in your ear by 700 times.

Rats multiply so quickly that in 18 months, two rats could have over a million descendants.

Cat urine glows under a black-light.

How tall is the tallest person ever?

What is the largest mammal on earth?

Which person is the fastest runner ever?

Is it physically possible for pigs to look up into the sky.?

What is the smallest mammal in the world?

Is it impossible for most people to lick their own elbow. (try it!)