Editing 1991 in science (section)

==Chemistry==
* [[Carbon nanotube]]s discovered in the insoluble material of arc-burned graphite rods by [[Sumio Iijima]] of [[NEC]].<ref>{{cite journal|first=Sumio|last=Iijima|title=Helical microtubules of graphitic carbon|journal=[[Nature (journal)|Nature]]|volume=354|pages=56–58|date=7 November 1991|doi=10.1038/354056a0|issue=6348|bibcode=1991Natur.354...56I|s2cid=4302490}}</ref><ref>{{cite journal|title=Who should be given the credit for the discovery of carbon nanotubes?|doi=10.1016/j.carbon.2006.03.019|first1=Marc|last1=Monthioux|journal=Carbon|volume=44|year=2006|url=http://www.cemes.fr/fichpdf/GuestEditorial.pdf|page=1621|last2=Kuznetsov|first2=Vladimir L.|issue=9|bibcode=2006Carbo..44.1621M |accessdate=2012-02-03}}</ref>