Google search bug returns porn results for 'contradictory queries'

A user on Quora has uncovered a bug on Google search that will yield porn site results without actually searching for it. The bug was apparently uncovered via Google's ability to solve equations -- entering them in a certain way causes the search engine to misinterpret your query. It's a result of the combination of impossible questions and what appears to be nefarious search engine optimization (SEO). It's important to note we haven't been able to replicate the bug with SafeSearch turned on and...