Cool tricks you can try on Google

Those are really cool and interesting tricks you can try on the Google Search Engine, at least for me, these next ones are most useful:

1. calculate tip!
  tool to calculate the fees and tip per person.

2. Books by author name
  easily you do a search about the books of your favorite author

3. Songs by singer name
  I did not try it but I assume it will work as the previous one.

4. 100 usd to "currency name"
    really cool!, there are a lot of currency

5. city to city distance
   try it, it is really cool, unfortunately it did not work on some cities I tried.

there are more of them, you may try them here

Cool, see you