Single ball bearings are an improvement over traditional oil-sealed bearings. In the form of a mixture of sliding friction and rolling friction, the cost of a double ball ...

With the rise of private space companies such as SpaceX and Blue Origin, new technologies and operating concepts are rapidly changing the development of commercial aerospa...

As of today, Australia With 75 confirmed cases and three deaths.Australia is far from making the top of the countries worst-affected by the new coronavirus. But thousands ...