“You see, it’s just enough space for airflow if the cap gets stuck in someone’s throat,” he explained. Business Insider reported that the hole is also there to equalize the pressure inside ...

An curved arrow pointing right. Pen caps have a small hole to prevent choking if swallowed and to equalize the pressure inside the pen to keep it from leaking. Produced by Emma Fierberg.

Dive into the precision process of manufacturing waterproof spark plug caps in a factory ... months in space Travis Kelce Admits Financial Pressure Challenged Retirement Decision 25 TV Shows ...

Admit it, you've always wondered why your pen caps came with those mysterious little holes in them. Are they for decoration? Was it an accident that everyone just ran with? Does it make the ink ...

If You See a Paw-Print Sticker on a Mailbox, Here's What It Means If You See a Blue Line Tattooed on a Dog, This Is What It Means If You See a Boot on a Fence, This Is What It Means If You See a ...