You’ve probably seen it dozens of times without a second thought: the small, circular hole in the lever of your nail clipper. At first glance, it might seem purely decorative or meaningless. However, this tiny hole is part of an ingenious design that allows nail clippers to function efficiently. The design dates back to the early 20th century, when personal grooming tools began to be mass-produced for households worldwide. Nail clippers consist primarily of two…
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