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Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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There are 20 feet of blood vessels in each square inch of human skin.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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![These monolithic figures from Easter Island suggest the contemplative nature of philosophy, which ca](https://biology-forums.com/gallery/47/medium_558257_07_07_16_12_28_22_236612306.jpeg)