When we hear the term "browser" we think of programs like Internet Explorer and Firefox. Google has its Chrome browser and it is wisely creating applications and tools that work best or only in heir browser. Microsoft does this too. (Try downloading some of their free Office templates in Firefox.)
Of course, the idea of "browsing" existed long before the Internet, and people have been doing this casual searching, whether it be for information, merchandise or, for animals, for vegetation.
Google has released a "Body Browser" that allows you to explore a detailed 3D model of human anatomy that includes all the major systems.
It could easily have applications in the classroom in a less than casual way. It's like Google Earth in that it can be fun for the casual browser, but it can also have serious applications.
It only works with browsers that have WebGL graphics support, and right now I believe that is just Chrome Beta.