Assumptions may save time, but they can prove disastrous. Here are some assumptions that can leave you permanently blind. “If you rub out something that’s in your eye, you’ll feel better.” Rubbing your eye is one way to drive a foreign object deep into the retina and permanently injure it. “Safety glasses protect your eyes.” That’s a good assumption if safety glasses are the correct eye protection for the situation (e.g., not a splash ...

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