Five More Interesting Facts! Yay!

Interesting Fact #6: 

A lobster's blood is colorless, but when exposed to oxygen, it turns blue. 

Interesting Fact #7: 

Black on yellow are the two colors with the strongest impact. 

Interesting Fact #8: 

Human thigh bones are stronger than concrete!

Interesting Fact #9: 

Sharks are immune to all known diseases.

Interesting Fact #10: 

Crocodiles are color blind.