Some lesser known Google search tips and hacks?

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. Alsolets 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> author shows 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".