common sense
n.
Sound judgment not based on specialized knowledge; native good judgment.
[Translation of Latin snsus commnis, common feelings of humanity.]
re·search
n.Scholarly or scientific investigation or inquiry. See Synonyms at inquiry.
Close, careful study.
v. re·searched, re·search·ing, re·search·es
v. intr.
To engage in or perform research.
v. tr.
To study (something) thoroughly so as to present in a detailed, accurate manner: researching the effects of acid rain.
To do research for: research a magazine article.
[Obsolete French recerche, from recercher, to search closely, from Old French : re-, re- + cerchier, to search; see search.]