an earnest-looking 3-foot vampire with an eye on the candy tray — easily warded off with a bag of M&M’s. But this year there’s a more sinister Trick-or-Treater on our planet’s doorstep ...

The fashion brand announced on Instagram on Monday that it has created a bag made 99% of air and 1% of glass with NASA’s nanomaterial “silica aerogel,” which it said is the lightest solid on ...