My favorite invention is the Soda Stream® which is practically a soda maker for home. This device makes my families life easier because we don't have to go to the store often and agree one flavor of soda. Also buying the flavoring is super cheap. One bottle of flavoring (50 liters) = $5. Who invented it? I don't know but I know it was invented in 1970/1980s and was popular in the UK.  The Soda Stream has a slim figure look a little like a thin coffee machine with a oval button on top and a bottle that looks helium miniature helium bottle on the back.