Aquariums

First Saltwater Aquarium

1838

French biologist notes having kept the first saltwater aquarium.
(https://en.wikipedia.org/wiki/Aquarium#History_and_popularization)

First mechanical air pump invented

1908

Pump was powered by water instead of electricity
(https://en.wikipedia.org/wiki/Aquarium#History_and_popularization)

First plastic shipping bags used to transport fish

1950

(https://en.wikipedia.org/wiki/Aquarium#History_and_popularization)

Silicone and tar used to seal tanks

1960

Metal braces would corrode, but silicone advanced to make the metal purely aesthetic.
(https://en.wikipedia.org/wiki/Aquarium#Design)

Fish Keeping 2nd most popular hobby to stamp collecing

1996

(https://en.wikipedia.org/wiki/Aquarium#Design)