Google Search is a great tool. Being able to use it appropriately is a whole other issue. Luckily, Google has realized this and provided a great resource for Educating how to use Google Search. Most of us that have done a Google search recently know about Google Instant which provides results as you type. But, there are also several other Google Search features that you might not have been aware of.
Google Handwrite lets you write your search right on the Google homepage and it is available on a mobile device and is activated in your mobile search settings. I can't say it is accurate unless you are good and writing with your fingers or a stylus, but still an interesting feature. See the video below.
Google Voice Search is an option for Android and iPhone devices which allows users to search using voice commands and then get the answer to a search question spoken back to you. Also, have you noticed the microphone on the search window recently on your browser? You can also doing a voice search if you have a microphone hooked to your computer. See the video below for more information.
Related Search Previews is another search option that shows previews for related searches in the search results. This can be helpful when looking for information that could be related to each other. Just mouse over "Related Searches" for a preview of the new set of results and click through to see the full results for that search as well. When I was conducting research I would always "right click" and "Open in a New Tab" these related searches so I would not lose them.
Search by Image is a great way to find copyrighted images or find when your photos or images have been used without permission. This is a valuable tool for teachers and students looking for where other images are posted on the web and to see if they can be printed or copied without permission. To search for an image users can "Drag and Drop," Upload an Image, Copy and Paste the URL for an image, or right click and image on the web with an extension for Chrome and Firefox. See video below for more information.
Google Knowledge Graph is a way to discover answers to questions you never thought to ask and explore collections and lists. The purpose is to help you research a topic faster and with more depth. Knowledge Graph allows users to use the search on any type of device. Depending on the search users can get an image based list that relates to the original search. See video below for more information.
If looking for some other Google Search information, I highly recommend checking out their Tips and Tricks. If wanting to get the latest information about Google Search, check out the Inside Search Blog.