The answer to life, the universe and everything

Google Calculator is a hidden feature in Google Search. You can type in all kinds of mathematical questions, or questions that give a mathematical-ish answer:

Try multiplying Roman Numerals like VII*X

Or doing conversions like 200 pounds in stone

Or calculations like how many seconds in year

There are other questions you can ask, like

What time is it in Philadelphia?

You should also take a look at my blog posting how American Google is still different from UK Google.

But my favourites are the off-the-wall questions, like "how often is once in a blue moon?" Apparently, it is thus: