Mechamical engineers are responsible for much of the physical technology you use on a day-to-day basis, including the hardware for this computer.

Without said hardware, you wouldn't be able to look at these cool animal pictures or play the fun game on the home page.

This is just one of the many fields of engineering.
Learn about more on the next pages.
(Also, try making the wikipedia ad go away)
Here are some sites you might like: Miles' Page Charlie's Page