When you see a claim that a common drug or vitamin "kills cancer cells in a petri dish," keep in mind:
[[A scientist stands on a chair next to a desk, pointing a gun at a petri dish. There is a microscope on the desk.]]
So does a handgun.
{{Title text: Now, if it selectively kills cancer cells in a petri dish, you can be sure it's at least a great breakthrough for everyone suffering from petri dish cancer.}}
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