This morning, a "bug" in Google was posted all over the Internet. You can imagine why this particular bug exists, and some folks at Hacker News are nosing around the theory that it's a result of Google using IEEE floating point arithmetic. That is, of course, just a theory. It should be noted that Microsoft's Bing also has this problem, though at a higher threshold. Wolfram Alpha, as you would expect, seems not to have an issue, though it does eventually dive into scientific notation for the psychotically large numbers you throw at it.
I'd imagine this is a result of some developmental choice made at Google 10 years ago, and in reality, it's not a very damaging bug. But still, fun stuff!