Google has upgraded their calculator in the search results. A couple days ago, if you searched for 2+2, it would show the answer as being 4. Now Google shows 4 but also gives you a full sized calculator to click on and do more calculations.
Here is a screen shot:
The new Google calculator is a fully functional 34-button scientific calculator.
Tal Cohen, from Google's Israel office posted this on his Google+ account and then noted that the Google Calculator team deserves kudos. He even mentioned who worked on this calculator and linked to their Google+ profiles, which have no content. We do know that the Google Calculator team is in Israel.
Update: A reader wanted me to point out it also impacts other calculations, like conversions and so forth. Keep in mind, Google has had a graphical animated scientific calculator for some time now.
Forum discussion at Google+.