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Scientists Find 2 Existing Drugs Can Reverse Alzheimer's Brain Damage in Mice
(www.sciencealert.com)
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Imagine Tylenol is found to cure a disease.
Tylenol is already approved, with known conditions under which it is safe and not safe.
Therefore, it is easier and safer to test a new use for Tylenol than starting from scratch testing a previously unknown drug.
Due to an unforseen supply issue, Tylenol is now $1000 a bottle.