What is Engineering anyway?
If you think engineering is only about building cars or bridges, you are missing out on a wealth of applications that will inspire kids. We would do well to remember that Engineering is simply the practical application of science and mathematics. In this light, the applications are endless.
Check out the following 2 links.
Here is an excellent recent article on Engineering.
Also, if you are looking for really big ideas to challenge your students, check out the Grand Challenges for Engineering in the 21st Century. released by National Academy of Engineering