The worlds lightest (ahem, least dense) material is about 100 times less dense than Styrofoam. That's just a little bit absurd. It consists of a microlattice of metallic tubes that are only about 100nm thick and the rest is just air. It is pretty tough, too. It can deform by 50% and still spring back to its original shape, unlike aerogels, which just shatter if you squeeze them too hard. I'm sure there will be many applications for this stuff, but super light electromagnetic shielding for is the first one that comes to mind.
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