tools automatically. We brush our teeth, turn doorknobs, open jars, and cut our nails without even thinking about it. These objects are so familiar that we rarely wonder how they work or why they are shaped the way they are.
Take the simple nail clippers .
It's small, inexpensive, and found in almost every home. You might even have one in your bathroom drawer, your purse, or your travel bag. You've probably used it thousands of times. Yet few people stop to notice one tiny detail: the small round hole at the end of the handle.
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