- The human body creates 2,500,000 new red blood cells every second.
- The night vision of tigers is 6 times better than humans.
- Crocodiles continually grow new sets of teeth to replace old ones.
- An astronaut can be up to 2 inches taller returning from space (the cartilage disks in the spine expand in the absence of gravity).
- 1 out of every 8 letters written is an e.
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