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1987 in science
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==Mathematics== * [[Gödel's ontological proof]] of the existence of God is published posthumously.<ref>{{cite book|first=Kurt|last=Gödel|year=1995|chapter=Ontological Proof|title=Collected Works: Unpublished Essays & Lectures|volume=3|pages=388, 403–404|publisher=Oxford University Press|isbn=0-19-514722-7}}</ref> * The [[Abelian sandpile model]], the first discovered example of a [[dynamical system]] displaying [[self-organized criticality]], is published by [[Per Bak]], [[Chao Tang]] and [[Kurt Wiesenfeld]].<ref>{{cite journal|author1=Bak, P.|author2=Tang, C.|author3=Wiesenfeld, K.|year=1987|title=Self-organized criticality: an explanation of 1/''ƒ'' noise|journal=[[Physical Review Letters]]|volume=59|issue=4|pages=381–4|doi=10.1103/PhysRevLett.59.381|pmid=10035754|bibcode=1987PhRvL..59..381B|s2cid=7674321 }}</ref>
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