Google Calculator inside Firefox

If you use browser Firefox, you should have noticed the Google search box. You can use it to make calculations.

To use Google's built-in calculator function, simply enter the calculation you'd like done into the search box and the answer appears in the drop down menu of suggested search options (sometimes you have to add and = at the end).
The calculator can solve math problems involving basic arithmetic, more complicated math, units of measure and conversions, physical constants and many other questions that have a unique answer:

How many seconds in a decade
315 569 260 seconds

Speed of light
299 792 458 m / s

17 to binary
0b10001

e^((pi)*i)+1
0

10th root of 1024
2

Half a cup in teaspoons
24 US teaspoons