“The idea sounds like fantasy: an invisible film that can be painted on your skin and give it the elasticity of youth. Bags under the eyes vanish in seconds. Wrinkles disappear.” But as the NYT’s Gina Kolata explains: Scientists at Harvard and M.I.T. have discovered that it is not fantasy at all. The film covering has several potential uses and can last more than a day at a time. (I still prefer Photoshop. It lasts forever.)