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‘99.99 percent air’: Boeing releases video of revolutionary lightweight metal Boeing has released a video of its groundbreaking microlattice metal, which is “the world’s lightest material,” scientists say. Microlattice is a 3D open-cellular polymer structure made out of small hollow metallic tubes, and represents a criss-cross diagonal pattern with small open spaces. The video gives exciting examples of the substance’s possible use, such as new structural components in aerospace. Microlattice could save a lot of weight and make planes much more fuel-efficient. Another example of the substance’s potential functions given by Sophia Yang, research scientist at HRL Laboratories, was the egg drop challenge: if you wrapped an egg in microlattice and dropped it from the 25th floor, you could easily win a bet as the substance would  “absorb the force that the egg feels”  and remain intact. The microlattice was initially created in 2011, with the researchers saying that it is