INSERT HILLARY EMAIL JOKE HERE: Two-dimensional material seems to disappear, but doesn’t. “When exposed to air, a luminescent 2D material called molybdenum telluride (MoTe2) appears to decompose within a couple days, losing its optical contrast and becoming virtually transparent. But when scientists probed further, they found that the disappearance is an illusion: the material remains structurally stable, and only its material properties change.”