- horses have 18 more bones than humans
- horses sleep standing up
- hot water freezes quicker than cold water
- house cats have 18 claws
- household dust is made of dead skin cells
- human thigh bones are stronger than concrete
- humans are the only primates that don't have pigment in the palms of their hands
- humans shed and regrow outer skin cells every 27 days - almost 1,000 new skins in a lifetime
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