"In some great moment, man can be perfect, it's possible. But for five minutes." - Psychologist Abraham Maslow Bigstock hide caption

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Maslow's Human Needs

Humans need food, sleep, safety, love, purpose. Psychologist Abraham Maslow ordered our needs into a hierarchy. This week, TED speakers explore that spectrum of need, from primal to profound.

Psychologist Abraham Maslow was a pioneer in positive psychology, envisioning what was right with his clients, rather than what was wrong. Corbis hide caption

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How Did Abraham Maslow Change Psychology?
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Circadian neuroscientist Russell Foster says it's time for us to take sleep seriously. James Duncan Davidson/TED hide caption

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Why Do We Need Sleep?
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Let's Go To Bed Vitamin String Quartet

"Security is survival. And until that need is met, other things are less important." - Computer security expert Bruce Schneier Dave Cole/TED hide caption

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What Does It Take To Feel Secure?
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Can't See Through It Disco Inferno

Psychologist Mihaly Csikszentmihalyi says we can achieve one of our most elusive needs, self-actualization, by seeking moments of "flow." Asa Mathat/TED hide caption

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What Makes A Life Worth Living?
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Baby What Do You Need 67 Purple Fishes