The aga saga is named for what invention created by Swedish physicist Gustaf Dalén?
Aga saga: The Aga saga is a subgenre of the family saga genre of literature. Aga saga:  The genre is named for the AGA cooker, a type of stored-heat oven that came to be popular in medium to large country houses in the UK after its introduction in 1929. AGA cooker:  Originally heated by slow-burning coal, the Aga cooker was invented in 1922 by the Nobel Prize–winning Swedish physicist Gustaf Dalén (1869–1937), who was employed first as the chief engineer of the Swedish AGA company (Swedish "Aktiebolaget Svenska Gasaccumulator", English "Swedish Gas Accumulator, Limited").
AGA cooker