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Currency conversion can be a pain, but Google can help take the strain.
For example, if I want to find the conversion rate for US dollars to British pounds, I type usd to gbp into Google to get an interactive calculator.
If I wanted to get specific I could type 500 usd to gbp.
You can also use the same trick for other conversions, such as miles to km, inches to feet and mb to tb.
Math is hard
Got a math problem that's taxing your brain but don't have the time/energy/brain cells to work it out the old fashioned way? Use Google!
Just type the problem into the search box to get the answer. Not only do you get the answer, but you also get a cool calculator.
If you just want to get up the calculator, type calc.
Narrow down your search
Sometimes the web is too big and you'll want to narrow down your search to a specific site or subset of sites. For example, if you wanted to search zdnet.com for everything to do with the iPad, you'd use ipad site:zdnet.com. Don't forget the .com or you won't get any results. This is extremely helpful for searching your own site.
Another way to use this is as a way to narrow down searches to a certain top-level domain (such as .com, .org, .edu). For example astronomy site:edu would limit astronomy searches to .edu websites.
This way is more complicated but easier in the long run and it helps you avoid using extensions. We'll use ZDNet as an example:
Click Settings. Under Search, click Manage Search Engines.
In the “other search engines” list at bottom fill in the three empty boxes as follows:
You can now search ZDNet directly by typing ZDNet followed by a space and your search terms.
PS, if you want to make it even easier, use the single character Z as the name in the first box. Then you can just press Z, space, search term, go.