Martin Luther King Jr. got a C in public speaking

Onions were found in the eyes of an Egyptian mummy

There's a species of jellyfish that's immortal.

The average person produces about 25,000 quarts of saliva in a lifetime.

Polar bears' skin is black, not white.

The Philippines consists of 7,641 islands

The world's oldest toy is a stick

A bolt of lightning contains enough energy to toast 100,000 slices of bread.

There's a species of jellyfish that can revert to its juvenile form after reaching maturity.

The first commercial passenger flight lasted only 23 minutes

Cleveland was once the country's fifth-largest city

A cat has 32 muscles in each ear.

A cow-bison hybrid is called a beefalo

Cows have best friends and can become stressed when separated from them.

The world's first animated feature film was made in Argentina

The Cadillac Eldorado was the first car to have a fully automatic transmission.

The Tesla Model S is the first car to have a 5-star safety rating in every category.

Cows have best friends and can become stressed when they're separated.

Sloths can hold their breath longer than dolphins.