- No two spider webs are the same.
- Each red blood cell lives an average of 4 months and travels between the lungs and other tissue 75,000 times before returning to bone marrow to die.
- The hydrochloric acid found in your stomach is strong enough to dissolve a nail.
- The Eiffel Tower is over 300m (984 ft) tall.
- Siderodromophobia is the fear of trains.
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