In the UK we put blue plaques to show the homes of famous people, this is my favourite one. - has the best funny pics, gifs, videos, gaming, anime, manga, movie, tv, cosplay, sport, food, memes, cute, fail, wtf photos on the internet!
Not just happiness. I hate when people say happiness, when they mean many other things. Happiness isn't everything; this experiment is still true for those who realize that seeking only happiness is shallow. Help others, and you gain much deeper things.