stem timeline by seangiles By sgiles1 300 telescope gailo Mar 10, 1100 magneticompass unowne Mar 10, 1793 cottiongin eliwhiney Mar 14, 1840 safety pin williamuined Mar 10, 1849 photos joseph vice Mar 10, 1900 tv philo fartsuoths Mar 14, 1903 airplan the wright broths Mar 14, 1920 frzon foods clarerce birdeye Mar 10, 1940 zipper tlias tloewe Mar 14, 1940 tape robert oppenher Mar 10, 1945 newset invention Mar 10, 1955 decade eneded Mar 10, 2000 paper cai cun Mar 10, 2008 oldest Mar 10, 2010 decade