HealthSmart contact lens monitors sweetness of diabetics' tears The contact lens measures glucose levels in tears and alerts the wearer to dangerous levels using a tiny light that looks like a speck of glitter News
HumansIn a Spotify world, why does anyone want to listen to cassettes? A US cassette firm is spooling up production again to meet demand. Do people really want to go back to the flimsy magnetic tape of the 1980s, asks Paul Marks Comment