Capturing a screen of your iPad into an image can be quite useful sometimes, without that option, making this tutorial would not be as simple as it was.
The original photo was taken in 1927 at the Fifth Solvay Conference where the most prominent and outstanding physicists and chemists got together to talk science.
You got a .rar file and you don't how to open it, some one asked you to send him "a rar file" or you just need a good archiving software? Download and install WinRAR.