Skyhook balloons were high-altitude balloons developed by Otto C. Winzen and General Mills, Inc. They were used by the United States Navy Office of Naval Research (ONR) in the late 1940s and 1950s for atmospheric research, especially for constant-level meteorological observations at very high altitudes. Instruments like the Cherenkov detector were first used on Skyhook balloons.

General Mills, Inc., is an American multinational manufacturer and marketer of branded processed consumer foods sold through retail stores. Founded on the banks of the Mississippi River at Saint Anthony Falls in Minneapolis, the company originally gained fame for being a large flour miller. Today, the company markets many well-known North American brands, including Gold Medal flour, Annie's Homegrown, Lärabar, Cascadian Farm, Betty Crocker, Yoplait, Nature Valley, Totino's, Pillsbury, Old El Paso, Häagen-Dazs, as well as breakfast cereals under the General Mills name, including Cheerios, Wheaties, Chex, Lucky Charms, Trix, Cocoa Puffs and Count Chocula and the other monster cereals.