If you ever thought that little hole on elevator doors was a secret spy camera, you’d be just like the rest of us. And just like the rest of us, you’d be wrong.
That little inconspicuous, odd hole on elevator doors is there in case the doors get stuck and need to be opened manually. It’s official, our days of thinking we’re being spied on by the elevator are over.
The Second Hole on a Jerrycan
If you've ever had to fill up a gas can for a lawnmower, or any other machine for that matter, you might have noticed that the jerrycan has two holes with caps on them. So what is that second, smaller hole for?
The second hole is actually there for safety. You're meant to remove the cap before pouring the gas in order to prevent "glugging," which would cause an unnecessary waste of fuel and potential fire hazard if it spilled.
The Dent on a Milk Jug
As you're probably well aware by now, milk jugs usually have a dent on one of the sides. And while many people will just chuck it up to a design decision, there is a purpose to this dent.
One of its purposes is to expand if there is a gas buildup, letting you know when the milk is spoiled. Another reason for this weird dent is to prevent the jug from exploding if it is dropped by mistake. The dent gives the jug expansion space that dissipates the sudden pressure that happens upon dropping the jug.
Flower Pot Holes
If you're trying to add more greenery to your space, you've probably come across the holes at the bottom of your flower pots. It turns out, these holes are holy to your plants. It's the difference between life and death in most cases!
They allow for proper water drainage and avoid stagnant water buildup that can be very harmful to your flora friend. The holes also allow for roots to expand and grow beyond the confines of the pot!
Escalator Brush
While most of us may use escalator brushes as a handy on-the-go shoe cleaner, they actually have a far more important purpose.
Escalator brushes, also known as an escalator skirt (how cute!), are there to prevent anything from getting caught in the machine. The brushes keep any objects at risk of being trapped, like your coat or shoes, at a safe distance.