Wikipeda allows to export pages in PDF format for saving, reading and sharing offline. You can also bundle different pages into one ebook. Open the relevant page on Wikipedia – go to Print/export tab on the left-hand navigation column. To make ebook click on Create a book. Very handy – remember though that Wikipedia content might not be always totally reliable or accurate. Still it’s one of the best ways to get an overview of the subject which is one of the key aspects of speed reading.