According to one widely-reported survey on job satisfaction, over half of Americans are unhappy at work. That's a real shame, because evidence is overwhelming that happier workers get more done.

Over the years, I've read hundreds of articles and books on this subject and condensed the advice they contain into a series of columns. I've also observed personally what makes me and my colleagues happier.

Here's the core of what you need to know, with links to columns that provide detailed plans, which in turn contain links to the scientific research behind the each core step.

1. Drink lots more coffee.

There's no two ways about it; coffee is the most readily-available, easily-consumed, brain-happiness vitamins on the planet. Coffee literally makes you smarter, healthier and happier and also has a weird and wonderful history. Drink up and start smiling.

2. Quickly rewire your brain.

Contrary to popular belief, the happiness you experience is not the result of events but of the habitual way you think about events. Science has shown that you can reprogram your brain to be happier in only 10 seconds. Extra effort can make happiness permanent.

3. Get painlessly motivated.

Motivated people are happy people, and vice versa, but where to start? Make motivation easy by listening to the audio editions of the 18 most motivational books ever written and watching the 7 most motivational movies for entrepreneurs.

4. Become a funnier person.

A great way to have fun is to create it yourself, by bringing humor into your everyday work. To help you out, here are two how-to lists: 5 Things Exceptionally Funny People Do and 5 Smart Things Really Funny People Do. (Also The 10 Funniest Books of All Time.)

5. Take baby steps each day.

When you look at how these 35 top entrepreneurs keep healthy and happy, it's clear that it's the little things that make a big difference. With than in mind, here are 57 minor tweaks that you can do, one-a-day, to make yourself happier.