I did a lot of side projects when I was in college, by a lot I mean a lot! All the way from wheeled robots (plenty of varieties) & wall climbing robots to magnetic levitation, solar power, wind energy, noval wind energy generation, free energy, generating energy from passing vehicles, piezo electricity and wireless charging !
Background
I always had the passion to know how things work! Partly from hours of watching TV shows like Gadget man, mythbusters, how things work etc. I have broken down plenty of house hold gadgets just to see how they work and what is inside, I think that is one of the reasons I have this logical eye to see things as to how they work rather than the beautiful outer packaging to things that most people see.