Editing 1933 in science (section)

==Chemistry==
* [[Gilbert N. Lewis]] isolates the first sample of pure [[heavy water]] by [[electrolysis]].<ref>{{cite journal|last=Lewis|first=G. N.|title=The Isotopes of Hydrogen|journal=[[Journal of the American Chemical Society]]|year=1933|volume=55|page=1297|doi=10.1021/ja01330a511|issue=3}}</ref>
* [[Morris S. Kharasch]] and [[Frank R. Mayo]] propose that [[free radicals]] are responsible for [[anti-Markovnikov addition]] of [[hydrogen bromide]] to [[allyl bromide]].<ref>{{cite journal|title=The Peroxide Effect in the Addition of Reagents to Unsaturated Compounds. I. The Addition of Hydrogen Bromide to Allyl Bromide|author1=Kharasch, M. S.|author2=Mayo, Frank R.|journal=Journal of the American Chemical Society|year=1933|volume=55|issue=6|pages=2468–2496|doi=10.1021/ja01333a041}}</ref><ref>{{cite journal|title=Radicals: Reactive Intermediates with Translational Potential|author1=Yan, Ming|author2=Lo, Julian C.|author3=Edwards, Jacob T.|author4=Baran, Phil S.|journal=Journal of the American Chemical Society|year=2016|volume=138|issue=39|pages=12692–12714|doi=10.1021/jacs.6b08856|pmc=5054485|pmid=27631602}}</ref>