This does not have to be restricted to 'hard' science, because political researchers are the worst habitual offenders. Archaeology, economics and market research are other areas where cause and effect is important, so should provide some excellent examples of how to establish cause and effect.
One such story is that of Nero merrily playing the fiddle while Rome burned in the Great Fire of the first century. It was during the night of the 18 th July 64 AD, when a fire broke out in the merchant area of the city.
Muttering a curse upon his tardiness, Sikes pushed Oliver before him; and they entered a low dark room with a smoky fire, two or three broken chairs, a table, and a very old couch: on which, with his legs much higher than his head, a man was reposing at full length, smoking a long clay pipe.