Styrofoam: amazing as an insulator, weighs next to nothing. the poor man's AeroGel
Fiber optics: okay can you say infinite bandwidth?
Microwave: do i need to explain why this is alien technology?
Space blanket: almost 100% reflects thermal radiation?
Crystal radio: c'mon folks, you KNOW there's a crystal in there, so WHY do you insist that crystals are "new age"? it's actually technology okay??
Tesla coil: you need to learn about this yourself, OBVIOUSLY ahead of it's time
Nylon: do you KNOW how they came up with this stuff?