The Hole in Pen Caps
Ever wondered why pen caps have a small hole? It's a safety feature: if someone accidentally swallows the cap, the hole allows air to pass through, giving time for medical help. This clever design can prevent choking.
Ever wondered why pen caps have a small hole? It's a safety feature: if someone accidentally swallows the cap, the hole allows air to pass through, giving time for medical help. This clever design can prevent choking.