Scientists have just unveiled the lightest human-made substance on Earth. How light are we talking? Let's put it this way: it's less dense than helium.
Last November, we told you about a metallic microlattice that was light enough to rest on the seed heads of a dandelion. At the time, it had just supplanted NASA's aerogel as the lightest material on Earth by a mere tenth of a milligram per cubic centimeter (the former has a density of just .9 mg/cm3; the latter an…
It looks like a wisp of smoke or even the work of a very confused spider, but this is actually a close up of the lightest material that has ever been created.