Here’s what the hole in a safety pin is really for

In high school, I pierced my navel with a safety pin. (Do not recommend.) These days, I prefer to wear them as earrings—I’m ...

Have you ever wondered why safety pins have a hole?

A seemingly simple hole on a safety pin, a century-old design, reveals ingenious engineering. This looped termination, born from manufacturing efficiency and stress distribution, prevents breakage and ...