What are some lesser known Google search tips and hacks?

Direct Answers
Search for the below keywords to get direct answers, instead of links:

  • Tip Calculator – Ask how to divide a bill and Google provides you a way. Also lets you calculate the tip amount.
  • Special Days – Looking for when Thanksgiving is this year? Search for special days to get to know and also opt for reminders on Google Now. 
  • Chemical Compounds – If you search for chemical compounds, you get an option to view their structure in 3D. 
  • Updates on Celebrities – Get regular updates on what celebrities are up-to, by subscribing for alerts on Google Now. One useful instance is when you want to get to know about latest albums from your favorite music artist.
  • Movie Release – Eager to know when the new Star Wars movie is going to be out? Or when was it’s last episode? Search <movie> release for the movie release date. 

    Also, search for movie(s) to get a listing of movies screening in your city. 

  • TV Show Schedule & Reminders – shows the list of recent episodes with air-dates and provides an option to set reminders for new episodes on Google Now. 
  • Books by an Author – shows the list of popular books by an author.

    Similarly, 
    Albums by an Artist – shows the list of popular albums by an artist. 
    Restaurants – shows the list of restaurants near by. 

  • Songs by an Artist – Shows a complete list of popular songs by an artist.
  • Flight schedule – <airline> <flight> lists the flight schedule.
  • Discover Competitors – Discover alternative products or find what to compare-to using Google auto-complete. 
  • Time – shows the current local time. Similarly, time <city> for the time in a specific city.
  • Weather – shows the weather forecast for your city. Similarly, weather <city>
  • Sunrise / Sunset – shows the sunrise / sunset forecast for your city. Similarly,sunrise <city>
  • Founder / Author / … – <company> founder shows the founder of the company. Similarly <company> ceo lists the CEO of a company and <book> authorshows the author of a book.
  • Capital – <country> capital lists the capital of the country. 
  • Dictionary – define <word> provides the word definition.
  • Calculator – Entering a math expression provides you with the result.  
  • Graph – graph for <math function> shows the function plot
  • Solve Geometry Problems – solve circle/triangle/rectangle/… 
  • Currency Converter – <Currency 1> in <Currency 2> gives you the conversion.
  • Unit Converter – <Unit 1> in <Unit 2> gives you the conversion. 
  • Stock – <Stock symbol> gives you the current stock value.

Personal Results from Google+
Join Search, plus Your World and get details of Friends and Pages in your circles.

Google Site Search
Search for results from a specific site, using site:<site>

Gmail and Google Drive Results
Join the Gmail Search Field Trial and get results from your emails when searching for related topics.

  • Emails
  • Calendar

    Similarly,
    Files – Search for my files to get results from Google Drive
    Photos – Search for my photos to get results from Google+ Photos
    Flight Information – Search my flights or itinerary to get results from Gmail about your travel itinerary. 

Google – (minus) operator
Hide results from a particular site or hide results containing a particular term using the – operator. Example: “searchquery -facebook” excludes all search results containing the term “facebook”.

Link on Quora