Virtual Hard Disk or VHD acts like a normal hard drive built into your computer. Cool thing is, it comes in a form of a single file so you can make a copy of it and virtually attach it to any other Windows computer.
By default Windows calculator doesn't support order of operation, to enable the functionality you need to activate the scientific view, let me show you how.
After almost 40 years, there is a new robot on the Moon and it was successfully launched by China. Check out a few pictures Chinese moon rover already captured up there.