Coworking is distinct from business accelerators, incubators, and executive suites. It is one of Dayton's technology business incubators housed in The Entrepreneurs Center building. The light bulbs grow and act as incubators or cocoons for toy airplanes inside them. After the war, Beckman adapted the oxygen analyzers for use in incubators for premature babies. It will combine research, education, industrial facilities, business incubators and exhibition centres. The U.S.-based International Business Innovation Association estimates that there are about 7,000 incubators worldwide. Various brands of incubators are commercially available to breeders. Bushnell founded Catalyst Technologies, one of the earliest business incubators. Whilst in San Francisco, the cofounders dealt with the San Franciscan startup incubators AngelPad. Knowledge Dock helps students start their own companies by supplying help and business start-up incubators. Gas incubators regulate the internal gas composition. Shaking incubators incorporate movement to mix cultures. Start up incubators and connectors include StartingBlock, gener8tor and University Research Park. They are sometimes described as incubators for international terrorism. The science and technology behind the incubators has since been expanded upon.