Discoveries and inventions?

Question

can yall name some things that were disvocoverd in the 19th century

and one thing disovered in the 20th century

example: Jonas Salk discovered the cure for polio

Answer 1

19th Century:  

Edison and the electric light (1879),

Maxim and the machine gun (1884)

Babbage and the programmable digital computer (1822),

Bessemer and the blast furnace (steel) (1855)

Nobel and dynamite (1867)

20th Century:  Wright Bros. and the flyer.

Answer 2

computers and the internet