What is Hard science?
'''Hard science''' is [[science]] that uses systematic [[observation]], [[experiment]]s and sometimes [[mathematics]] to get [[knowledge]]. In hard science, experiments have to be reproducible (if the experiment is done a second time, it will have to produce the same [[wikt:result|results]] as the first time). Also, in hard sciences there is usually good agreement as to what is known for sure. This is not true of soft sciences. Also, in hard science there is a world-view or [[theory]] which is widely agreed.<ref>Popper, Karl 1959. ''The logic of scientific discovery''. London & New York: Routledge Classics. {{ISBN|0-415-27844-9}}</ref><ref>Kuhn T.S. 1970. ''The structure of scientific revolutions''. 2nd ed, University of Chicago Press. p206 {{ISBN|0-226-45804-0}}</ref><ref>Bunge, Mario 1967. ''Scientific research''. Volume 1: The search for system; volume 2: The search for truth. Springer-Verlag, Berlin & New York. Reprinted as ''Philosophy of science'', Transaction, 1998.</ref><ref>Ziman, John 1978. ''Reliable knowledge: an exploration of the grounds for belief in science''. Cambridge University Press. {{ISBN|0-521-22087-4}}</ref> Hard science subjects include the [[natural sciences]], which are about the natural world. These include [[physics]], [[chemistry]], [[biology]], [[geology]], [[astronomy]], and [[botany]]. Soft science is any of the [[social sciences]], including [[history]], [[sociology]], and [[political science]]. Those sciences are soft because something could be done more than once, and produce a very different result each time. Also, there are radical disagreements between various schools of thought.<ref>{{cite web |url=http://chemistry.about.com/b/2012/02/18/difference-between-hard-science-and-soft-science.htm |title=Difference between hard science and soft science |access-date=2013-01-31 |last=Helmenstine |first=Anne Marie |date=2012 |archive-date=2013-01-17 |archive-url=https://web.archive.org/web/20130117045623/http://chemistry.about.com/b/2012/02/18/difference-between-hard-science-and-soft