Metamaterials stories

Imagine picking up a lump of material and squeezing it, only to have it expand. The more you squeeze it, the more it expands, and to compress it, you have to stretch it back out. This is totally backwards from the way the world should work, but a new class of mechanical metamaterials could make it possible.
Don't look now, but researchers have managed to create a material that you can wrap yourself in to immediately become invisible to not only your microwave, but also every other microwave on the entire planet. Yes, we can all rest easier tonight knowing that we finally have a defense against the coming uprising of microwave ovens.