Zombocalypse
Quintessential Badboy
Not sure love is the best example. Might be difficult to explain, though I'd argue its a case of linguistic insufficiency.
Scientific studies of love both on the biological and anthropological levels have set up a number of ways to understand it both chemically and culturally. Its not exactly the romanticized enigma we've made it out to be.
The thing that makes love inexplicable is the fact that even though Pamela Anderson is universally attractive, we don't all fall in love with her. Instead, we fall for those regular people without any reason to. We see it everywhere, people falling for those who are not attractive.
I don't think science can explain that.