All that mining and trucking rock around was expensive, even though the basic idea, heating the rock, has always been very simple, so simple that you can even do it at home, as NPR's technology reporter Nell Boyce explains.
While Milburn's goals helped Newcastle to victory in the FA Cup in 1951, 1952 and 1955, Shearer has been the rock the club have always relied on during turbulent recent times.