1) In one square inch of our hand, we have nine feet of blood vessels, 600 pain sensors, 9000 nerve endings, 36 heat sensors and 75 pressure sensors;
2) Our nose is our personal air-conditioning system: it warms cold air, cools hot air and filters impurities;
3) And speaking of noses . . . this is not exactly a “fun fact,” but a person can expect to breathe in about 45 pounds of dust over his/her lifetime.
