Editing 1909 in science (section)

==Births==
* January 5 – [[Stephen Cole Kleene]] (died [[1994 in science|1994]]), American [[mathematician]].
* February 9 – [[Giulio Racah]] (died [[1965 in science|1965]]), Italian–Israeli mathematician and physicist.
* February 18 – [[Warren Elliot Henry]] (died [[2001 in science|2001]]), American [[physicist]].
* March 22 – [[Nathan Rosen]] (died [[1995 in science|1995]]), Jewish American physicist.
* April 13 – [[Stanislaw Ulam]] (died [[1984 in science|1984]]), Polish American mathematician.
* April 22 – [[Rita Levi-Montalcini]] (died [[2012 in science|2012]]), [[Italian Jews|Italian Jewish]] [[neurologist]], recipient of the [[Nobel Prize in Physiology or Medicine]].
* May 7 – [[Edwin H. Land]] (died [[1991 in science|1991]]), American inventor and founder of [[Polaroid Corporation|Polaroid]].
* September 14 – [[Peter Scott]] (died [[1989 in science|1989]]), English [[Conservation movement|conservationist]].
* August 1 – [[Sibyl M. Rock]] (died [[1981 in science|1981]]), American mathematician.
* November 24 – [[Gerhard Gentzen]] (died [[1945 in science|1945]]), German-born mathematician.
* December 11 – [[Toshiko Yuasa]] (died [[1980 in science|1980]]), Japanese [[nuclear physicist]].
* December 14 – [[Edward Lawrie Tatum]] (died [[1975 in science|1975]]), American [[geneticist]], recipient of the Nobel Prize in Physiology or Medicine.