Few funny scientific facts

These are some funny facts that I read in some article.
Sorry if some facts are not correct. Fell free to Comment them and dispute them

Pigeons moving his head back and forth while walking to stabilize the picture in front their eyes.

Some statistics say that 1.6 percent of people feel pain when they see someone else in pain.

In Norway there is a king of penguins who have a military rank. By the guardians, the penguin always recognizes them and is always happy to see them.

There is a law in Switzerland forbidding to keep only one guinea pig as a pet.

In Japan live crabs with a hideous shield that looks like a mad face.

People with blue eyes appeared much later than the invention of pottery.

Cuts paper hurts more than just cuts, or because there is very little blood or none at all, which leaves nerve endings open to the air.

The bee can kill another bee. If a bee who does not live in the hive tries to enter it, the special guardian bees emit pheromones while other bees attack intruders.

The nearest living descendant of Tyrannosaurus Rex is a chicken

American psychologist proved in his research that the amount of hair on the body affects intelligence. The more hair you have, the smarter you are. Dr. Aikarakudy Alias claimed in 1996 that doctors and other educated people are more likely to have hair on their chest.

In Colombia there is a multicolored river Caño Cristales. It is known that its water can have five different colors: red, yellow, green, blue and black.

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In 1973, Japanese authorities decided to change the blue color to the traffic light in the shade of green. Now all local traffic lights are green, but human eyes still see this color as blue.