There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
five week embryo
seven week embryo
Neuron from Chicken embryo
Leonardo da Vinci, Embryo in the Womb.
Typical characteristics of r-selected and k-selected species