It's called wolfram alpha, and there's an article by Conrad Walters in today's SMH.
It's the 500th anniversary of John Calvin, so here's the result I got when I 'wolframmed' him.
And here's the result when I wolframmed my exact birthday.
Here, intriguingly, is what I got by wolframming "10% of 365 days".
One day, this could turn out useful.