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

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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.

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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.