Do u believe in the art and science of happiness?

Once you learn to differ being happy from being content, it gets clear.
Happiness is an incontrollable, fleeting, reflex-like emotion. It comes and goes in waves, similar to other emotions.

Contentment, on the other hand, is something malleable.
See, when you give extra attention to what brings you joy, you can bend your level of contentment to your conscious will, which makes it easier to "feel happy" more often :)

I am not sure if I have cracked it, I think I am still not wise enough and I feel all emotions as they come. But since I have been working on what I pay most attention to, I do feel more content :)

I've read many and watched lots of videos on the subject.
No, they didn't help because my unhappiness comes from my programming from which I operate 95% of the time. The information from books and videos is registers in my [i]conscious[/i] mind. So, even though I understand the new information perfectly, as long as the [i]habit[/i] mind is running the show, what I've learned consciously is ineffective.

They aren't going to teach me anything I can't arrive to on my own.

Give me millions of dollars and that right there would be happiness

I find it interesting but not terribly useful. There is no one way fits all.