Please urgent help. need factsa about period from 1916-1930?

Question: Please urgent help!. need factsa about period from 1916-1930!?

it has to be science related and important to the whoe world!. not just a random fact!. need 7Www@QuestionHome@Com

Best Answer - Chosen by Asker:

Greatest Scientific Inventions:
1916 : sonar

1920 : hair dryers; kiss-proof lipstick; submachine guns

1921 : robots; insulin

1922 : Aga cooker

1923 : hearing aids

1924 : frozen food

1925 : Geiger counter; television

1926 : liquid fuel rocket; pop-up toaster; aerosol sprays

1927 : ‘Talkies’ at the movies

1928 : iron lung; penicillin

1929 : artificial life

1930 : jet engine; mechanical toothbrushes; Scotch tape
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