Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
Blank cell diagram
Galaxies with Rings
Tree Rings
The annual pattern of rings changes with ocean temperature and coral health