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When I was searching for Laptop I found everywhere two or three kind of Laptops and PCs.  When I inquired deeply it's operating system was different and it's apps were also. Searching through mobile and computers I got some comes in cheap and some come in less cost but some came on the screen in very high cost. So I will tell about the all.  Linux : Linux laptops come in very cheap price. It has free and opensource operating system that is why its less sellable laptop but it's very secure laptop. Mostly softwares can be develop on these laptops with has less apps in stores.  Windows: When Microsoft came in front of the world. People got surprised because it had very useful apps as product in operating system and it was available in very less price. Mostly children and normal consumer use these laptops.  Apple Mac: Mac is first computer in the world and it's usable for high level product development. It's costly laptop and pcs. It's software and app

Automobile Break?

According automobile expert break should be made by rubber. 
I will explain how to use it? 
I will explain how it works? 
I will explain why it works? 
Think the circle of any vehicle is going freely or speedy then you press in favor of legs or hands. 
Check pic below how we fill happiness by pressing bicycle break.
near handle it is break in both side.

How it works? 
It works via handle and paddle.By paddle we jump legs on it and it gives speed but when we give break then it press rubber products to stop vehicle and then bicycle stops. 

Why it works? 
It's important to save life. In mostly 4 wheeler it's controlled by legs and in other vehicle which is not based on fuel. It works by hand and it gives more speed after leaving it so it sleeps on earth or roads.