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1956 in science
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==Biology== * March β [[Denham Harman]] proposes the [[free-radical theory of aging]].<ref>{{cite journal|last=Harman|first=Denham|title=Aging: a theory based on free radical and radiation chemistry|journal=[[Journal of Gerontology]]|volume=11|issue=3|year=1956|pages=298β300|pmid=13332224|doi=10.1093/geronj/11.3.298|citeseerx=10.1.1.663.3809}}</ref> * [[Wesley K. Whitten]] reports developing eight-cell mouse [[ovum|ova]] to [[blastocyst]] stage ''[[in vitro]]''.<ref>{{cite journal|title=Culture of Tubal Mouse Ova|first=W. K.|last=Whitten|doi=10.1038/177096a0|pmid=13288608|journal=[[Nature (journal)|Nature]]|date=14 January 1956|volume=177|issue=4498|page=96|bibcode=1956Natur.177...96W|doi-access=free}}</ref>
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