Editing 1929 in science (section)

==Chemistry==
* [[Sir John Lennard-Jones]] introduces his [[linear combination of atomic orbitals]] method for approximation of [[molecular orbital]]s.
* [[Lars Onsager]] publishes his [[Onsager reciprocal relations|reciprocal relations]] equations in [[thermodynamics]], for which he will receive the [[1968 in science|1968]] [[Nobel Prize in Chemistry]].
* [[Linus Pauling]] publishes [[Pauling's rules]], key principles for the use of [[X-ray crystallography]] to deduce molecular structure.<ref>{{cite journal|date=1929-04-05|title=The Principles Determining the Structure of Complex Ionic Crystals|journal=[[Journal of the American Chemical Society]]|volume=51|issue=4|pages=1010–1026|doi=10.1021/ja01379a006|last=Pauling|first=Linus}}</ref><ref>{{cite web|title=Linus Pauling: The Nobel Prize in Chemistry 1954|work=Nobel Lectures, Chemistry 1942–1962|publisher=Elsevier|year=1964|url=http://nobelprize.org/nobel_prizes/chemistry/laureates/1954/pauling-bio.html|accessdate=2007-02-28}}</ref>
* [[Styrene-butadiene]] is developed  by German chemist [[Walter Bock]].