Breakthrough metal is barely heavier than air

Researchers at a lab in California have created a new type of metal, that is almost as light as air.

This metal could be used to make new cars or airplanes, it would save a lot of fuel. It's a strong metal but it's mostly made of air. When it's squashed, it rebounds out to 98% of its original height. The metal was made out of lattice of interconnected hollow tubes with a wall thickness of only 100 nanometers, which is 1,000 times thinmer than a human hair. Doesn't sound too strong, but some scientists disagree.