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 Square Hole on the McFlurry Spoon
McDonald's ruined many a person's diet when it introduced the scrumptious McFlurry ice cream. If you've ever had the pleasure of enjoying one of these, you definitely noticed that they give it to you with a very weird-looking spoon.
The McFlurry spoon has a square-shaped hole through its handle, and it's actually used as an attachment to the machine that mixes the ice cream and toppings together. The machine's bar slips into the spoon and stirs it thoroughly. The only reason they give you the spoon with it is to minimize the mess. Pretty neat, right?
Order of the Letters on a Keyboard
Keyboard creators must have a good reason to not arrange those letters alphabetically. Not doing this seems pretty counterintuitive. Well, there is a reason for this, and surprisingly, it didn't start out like that. The first keyboard did, in fact, have letters that were arranged alphabetically.
But since typewriters were once clunky devices with metal arms, expert typists would type too fast and inevitably jam the keys over overly-quick usage. As a result of this, keyboard manufacturers decided to randomize the order of keys, thus slowing down the typists and giving each letter a little ‘break’. By now, the world is far too used to the order of the letters, so it doesn’t look like we’re planning on going back anytime soon.
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.
The Little Hole on Elevator Doors
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.