Why there is a rubber disk in the plastic bottle caps? | 12 interesting hidden features we never notice?

1. Why there is a soft little disk in the caps of the plastic bottle?

Most plastic bottle caps have a soft little disc inside. Pull it out, and you'll still be able to close your bottle. But if you don't have that soft part and turn your bottle upside down, the liquid may leak out. 

Another purpose of this soft pad is to keep your soda carbonated for a longer time. 

 

 

2. Soda bottle shape

Soda bottles also have small secrets of their own. Their long necks are made this way to keep your drink cool for a longer time. And if you only touch the neck of the bottle instead of its body, you won't have enough time to warm your drink up. 

 

 

3. Use your food container as a plate

Hungry? It might be a good time for some Chinese food! But keep in mind the takeout container isn’t only a good way to carry your food.  

Unfold it – and you'll have a nice paper plate to properly enjoy your meal. 

 

 

4. Why there is a hole in the elevator door

The hole you might have noticed in the elevator door comes in handy when an elevator gets stuck. 

In this case, a mechanic needs to operate it manually. They have a special key that gets inserted in that very hole, which releases the doors. 

 

 

5. Check the side of the gas tank of the car from inside the car

Lots of people keep forgetting which side of their car the gas tank is on.  

Luckily, on the dashboard, there's a small gas pump next to the fuel gauge. 

It has an arrow pointing left or right. This arrow lets you know which side you're supposed to pull up to the gas pump. And you don't even need to go out of the car to check it. 

 

 

6. Forget to remove the gas nozzle? what will happen next?

Let's say, you got distracted and climbed into your car while the gas nozzle was still in the tank. No worries, even if you accidentally drive off like that, nothing terrible will happen. The nozzle has a special break-away device. 

This device makes the nozzle and hose detach if you pull on them with enough force. 

Now, embarrassment? Well, I can’t help you with that one.

 

 

7. How to pour ketchup properly

Just a little bit of ketchup left? No need to hit the bottom of the bottle for the product to come out. Instead, try tapping the middle of the bottle. 

But not just any spot. There's a specific place with the number on most ketchup bottles.  

That's where you should tap if you want to make the rest of the ketchup appear. 

 

 

8. Why there is a circular shape on the side of a plastic milk container?

If you prefer to buy milk in plastic containers, you've probably seen big circles on their sides. These circles absorb the shock if you drop the milk jug on the floor. 

They also create some extra room for the jug to expand if needed. That's how you can see if the milk's turned bad without tasting it.  

 

 

9. Prefer the wooden hanger instead of a plastic one

In most cases, wooden hangers are more expensive than plastic ones. 

Then why use them? They do look more elegant and fancier. But more importantly, they are made out of cedar. And that's a special type of wood that's known to repel bugs. 

A nice way to keep your clothes safe. 

 

 

10. Why there is a black dot beside the camera on phones

If you're an iPhone user, you must have noticed a small black dot between the flash and the lens on the back of your phone.  

The dot is there to provide you with better sound quality. It also cancels out background noise, especially when you're in some crowded place, like a concert hall. 

 

 

11. Know the use of an eraser properly

Lots of erasers have two parts. Most people believe that the rougher end can be used to get rid of ink, but that's not quite true.  

The darker side, usually gray or blue, is there to erase pencil markings from grainy paper, like the one used by artists. 

And the pink side is supposed to erase stuff from more delicate paper. 

 

 

12. Don't throw the used tissue box in the dustbin

Once all the tissues are out of the tissue box, don't throw them away immediately.  

You can use it to store plastic bags and pull them out whenever you need them. A good way to keep your kitchen more organized.