Brandon432

Brandon432 t1_iwgreof wrote

Reply to comment by therandomopera in How an engine works. by ooMEAToo

This animation/video is a bit simplified. In real life, a couple things are different. The part at the top of the valve (or linked via pushrods and rockers) that actually contacts the camshaft is called the tappet. Tappers can be “flat” (not literally, they still have a bit of crown) or roller style. In either case, the tappet is made of friction resistant alloy and does NOT break contact with the cam. It follows the entire lobe so there is no “striking” just rubbing. Roller tappers greatly reduce friction but increase mass. In either case, the cam and tappets are enclosed in the engine head and continually fed motor oil to reduce friction and dissipate heat.

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Brandon432 t1_ivosqo4 wrote

First, cancer is a a single disease. It is 100 diseases. Even breast cancer, lung cancer, or skin cancer each comprise a half dozen common types and dozens more rare types.

Second, cancer isn’t a foreign cell, like a venom protein, bacteria, or virus. Cancer is your body’s own on cells run amok, replicating without control in places they shouldn’t.

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Brandon432 t1_ivoqxqp wrote

Some patients develop a sensitivity to anti-venom. However, there is a common myth that you cannot have anti-venom more than once. It is totally false. If you do develop a sensitivity and have a reaction from a subsequent administration of anti-venom, that reaction is very easily managed in a hospital setting.

Addressing your comment below, anti-venom does not provide much if any lasting benefit. Snakebite vaccinations have not shown effective in humans or pets. First, the venom antibodies are relatively short-lived. Second, vaccinations work well when your immune system gets to have a fair foot race with an incubating infection. Snake bites don’t work that way. You can be delivered a lethal dose in half a second. No amount of vaccination can prep your body to catch up with a sudden envenomation.

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