Google Gravity is a java script-based search engine trick that Google programmed in 2009. The original method for activating it may not work on your computer, because of changes to Google's reprogrammed search page and automatic results. If so, you can access Google Gravity through a special link. Have you ever seen your web pages turn upside down or might seem like falling down? In the Google Gravity tricks, you can find all such amazing and cool stuff. The content of web page are related to gravitational pull and they commence acting adversely. Google Gravity comprises a plenty of entertaining stuff which probably tends to baffle anyone with its mind blowing ideas. With Gravity google, you can easily confuse anyone and make their time worth spending in something insane and unique. Google Gravity Best Google Gravity Tricks Which Will Amaze You in 2018

You might try the browse the sites:
Stack Overflow

Also using the keyword in google would be easier
C++ tricks

No-One has thought to create a generic problem guide for cannon printers however if you look about on some printer websites you may be able to compile your own list.