"William A (Bill) Mitchell invented Pop Rocks Crackling Candy in 1956 as an attempt to create an instant carbonated drink. The fruit-flavoured candy contained entrapped bubbles of carbon dioxide, which when released created tiny explosions with sound effects ... Drawing on interviews with food technologists, engineers, marketing managers, and members of Bill Mitchell's family, Rudolph takes readers from the day Pop Rocks were invented to the present day." (Quoted from site)