Shortcut 'diff' search on Google for 'What is the difference between ... and ...'
How it works?
1- Type 'diff' on address bar
2- Press space or tab. You will see address bar is ready for DIFF search
3- Then type what you would like to search. example: 'humans and animals' or 'coffee and tea' etc.
4- Press enter
5- It will search on Google as 'What is the difference between human and animal'