When you search for a very popular term in google, you will notice that a variety of different kinds of results show up including videos, news articles, blog posts, pictures, regular search results etc. Google called this feature Universal Search.
So basically if you search for a renowned person that is likely to generate a lot of different kind of results (e.g. news, photos, videos etc.) you will be able to see it’s effectiveness clearly. Amit shares the following screen shot which appears if you search for Barack Obama in Yahoo Glue.
Read more about Yahoo Glue in Yahoo! Cool Things of the day blog.