Name The Year: Dr. Jonas Salk announced a new vaccine against polio?

Questions

In 1985 23rd Space Shuttle Mission - ---------- 2 is launched. ?

In 1701 Anders Celsius, scientist, invented ---------- temperature scale ?

In 1895 Alfred Nobel establishes ---------- prize. ?

In 1910 NY's Penn Station opens as world's largest ---------- terminal. ?

In 1945 Gen George C. Marshall named special U.S. envoy to---------- . ?