The metal ice tray in that video freezes water 30 to 50 percent faster than the plastic one in your kitchen right now. Aluminum conducts heat roughly 1,000 times better than the plastic most modern ice trays are made from.The lever design was invented by a GE engineer named Edward Roberts, who filed the patent in 1949. At General Electric, it was sold as the Redi-Cube. Ads in the 1950s marketed it under names like "Magic Touch" and "Honeycomb," pitching the simple satisfaction of pulling one han