Editing 1998 in science (section)

==Physics==
* [[January 1]] – Argentinian physicist [[Juan Maldacena]] publishes a landmark paper initiating the study of [[AdS/CFT correspondence]], which links [[string theory]] and [[quantum gravity]].<ref>{{cite journal | last1=Maldacena| first1=Juan | title=The Large N limit of superconformal field theories and supergravity | journal=Advances in Theoretical and Mathematical Physics | volume=2 | issue=4 | year=1998 | pages=231–252 | arxiv=hep-th/9711200|bibcode = 1998AdTMP...2..231M | doi=10.4310/ATMP.1998.V2.N2.A1}}</ref>
* May 11 & 13 – [[Nuclear testing]]: The [[Pokhran-II]]: India detonates the five nuclear devices in [[Pokhran|Pokhran Test Range]], an [[Indian Army]] base.
* May 28 – Nuclear testing: The [[Chagai-I]]: In response to India, Pakistan conducts five underground and simultaneous nuclear weapon-testing experiments in the [[Chagai Hills]], thus becoming the first nuclear weapon state in the Muslim world and the seventh in the world.
* May 30 – Nuclear testing: The [[Chagai-II]]: As part of a tit-for-tat policy, a final plutonium implosion test is carried out in the [[Kharan Desert]].
* June 5 &ndash; Experimental proof is obtained that [[neutrinos]] have mass.<ref>{{cite news| url=http://news.bbc.co.uk/1/hi/sci/tech/106629.stm | publisher=BBC News | title=Ghostly particles rule the universe | date=June 5, 1998}}</ref>