The back button rewinds to the most recent page you looked at. This *might* work, but only if you just left your starting page.

In the computer lab, when you first opened the web browser, it went to Yahoo!. If you went to another site, and wanted to return to Yahoo!, which button on the toolbar would you push to return there right away?

The back button
The forward button
The stop button
The refresh button
The home button