3D printing allows the construction of physical objects based on three-dimensional digital models. A futuristic notion until recently, such printers are now commonly found in high schools, university libraries and labs, and also in a fabulous array of high-tech companies producing medical devices, and yes, body parts of all kinds.
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Perhaps the only advantage of getting old is being able to look back and see what worked and what didn't. Knowledge of severe vitamin deficiency diseases is an example of learning the hard way. The association of vitamin B1 (thiamine) with beriberi was perhaps the first example of the consequences of refining a food. Milling away the unattractive outer husk of the rice that contained the thiamine caused the disease. No drug could substitute for that missing, essential, "vital amine." That's how "vitamins" first got their name.
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