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In a devastating of example critical thinking gone bad, highly educated, deeply caring parents avoid the vaccinations that would protect their children from killer diseases. I love critical thinking and I admire scepticism, but only in a framework that respects evidence. So if you are sceptical about the measles vaccinations, I ask you to do two things. First, make sure you know what it looks like when a child dies of measles. Most children who catch measles recover, but there is still no cure and even with the best modern medicine, one or two in every thousand will die from it. Second, ask yourself, βWhat kind of evidence would convince me change my mind about vaccination. If the answer is βno evidence could ever change my mind about vaccination,β then you are putting yourself outside evidence-based rationality, outside the very critical thinking that first brought you to this point. In that case, to be consistent in your scepticism about science, next time you have an operation please ask your surgeon not to bother washing her hands.
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Hans Rosling (Factfulness: Ten Reasons We're Wrong About the World β and Why Things Are Better Than You Think)