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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
There are more sensory neurons in the tongue than in any other part of the body.
Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
![Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater,](https://biology-forums.com/gallery/47/medium_33_17_02_12_6_59_59_20201820.jpeg)
![The asymmetry of facial expressions. Notice that the expressions are more obvious on the left side ...](https://biology-forums.com/gallery/30/medium_548020_07_06_17_2_27_45_304212084.png)