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TIL there is a promising treatment for cancer involving the genetic modification of viruses such as smallpox and even HIV. These viruses are being injected into the bloodstream and have been shown to kill certain cancers without spreading the used virus within the patient.

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ANp6g TIL some boys used to be castrated so as to keep their soprano voices due to not reaching sexual maturity. Their rib cages were also bigger allowing them more lung and vocal capacity. There is only one known recording of a castrato
k4Y1 TIL George Washington was within scope of a British sniper. The marksman thought it would be dishonorable to shoot a man in the back, and didn’t fire.
BrePy TIL to solve this box labelling problem. There are 3 boxes labelled as Bananas, Strawberries and Mixed. All of the labels are labelled incorrectly. You can reach only into one box and you can take one fruit from it. Then you have to fix the labels correctly.
XyLD TIL that curly hair is curly because the hair follicle it grows from is oval and straight hair is straight because the hair follicle it grows from is round. Straight hair is like a straw (except tinier) and curly hair is like a slightly squeezed tip of a straw.
yQdRe TIL for over a decade, NASA used 11 deaf people with damaged vestibular systems (making them immune to motion sickness) to explore how extreme forces might affect astronauts. One test had four men spend 12 straight days in a 20-foot-wide room rotating at 10 revolutions per minute.