"What is Love?" A heavily loaded question that's on every one's minds around this time of the year. Depending on whom you ask, you are bound to get a different answer. It could be a form of social attachment bond or being with someone special or pure selflessness or an intense infatuation caused by a bunch of chemicals creating havoc in your brain or just a simple smile. This Valentines Day, we looked at what people on the street think love is, and used science to explain what happens when we fall in love.