Light and strong metals have incredible technological and medical applications.  Tungsten for example has gotten a lot of press lately for these reasons.  And apparently they have made a metal now that is lighter than all other metals:

Microlattice is the lightest metal ever made. At 99.99% air, it’s light enough to balance on top of a dandelion, while its structure makes it strong. Strength and record breaking lightness make it a potential metal for future planes and vehicles. 

Let’s check out this unusual metal in the video on page 2

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