Here are the nation's top thinkers on how to be happy, improve our sex lives, and more

Dr Helen Fisher

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Helen Fisher, biological anthropologist

Most of us have no idea why we react certain ways or make specific decisions.

But five psychologists are up for the task of figuring out what it is that makes us human.

We recently compiled a list of 50 scientists doing amazing work around the world. Here are the psychologists whose work is redefining the way we look at what goes on inside our heads.