60 Stupidly Simple Facts That Will Blow Your Mind By Thought Catalog 12. The surface of Mars is covered in rust, making the planet appear red. 13. Cashews come from a fruit. 14. Hippopotamus milk is pink. 15. Rainbows are circles. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16