MIT researchers developed a lightweight 2D polyaramid polymer (2DPA-1) that is nearly impenetrable to gas molecules, with permeability at least 1/10,000 that of existing polymers. Published in Nature, the film made from melamine building blocks is stronger than steel with one-sixth the density. A 60-nanometer-thick coating extended perovskite crystal lifetime by weeks, with bubbles created in 2021 still inflated, according to Michael Strano, Carbon P. Dubbs Professor at MIT,