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Workers try to remove some of the 11 million gallons of oil spilled by the Exxon Valdez off Alaska in 1989. The ship's third mate may have been up for 18 hours before the accident. Rob Stapleton/AP hide caption

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Carolyn Walworth is a junior at Palo Alto High School (the main building of which is shown here in 2012). After four recent suicides in her school district, she wrote an op-ed about the stress faced by students in the area, which is home to some of the nation's most competitive public high schools. Ho John Lee/Flickr hide caption

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TMAYD founder Izzy Lloyd (right) gives a friend a hug after asking about her day. Maia Weinstock/MIT hide caption

itoggle caption Maia Weinstock/MIT

Engaging, mentally stimulating work is good for the brain, scientists say, whether you get paid to do it or not. Running a household can be as mentally demanding as running a company. iStockphoto hide caption

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Work partners Jon Chintanaroad (left) and Mike Prestano are all smiles now, but founding a tech startup together threatened their friendship — and their business. April Dembosky/KQED hide caption

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A color-enhanced cerebral MRI showing a glioma tumor. Scott Camazine/Science Source hide caption

itoggle caption Scott Camazine/Science Source

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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Circadian neuroscientist Russell Foster says it's time for us to take sleep seriously. James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

"The bonds of community, of tribe, are a very, very particular thing." - Sebastian Junger Courtesy Of TED hide caption

itoggle caption Courtesy Of TED

"To have self esteem ... it just takes work." - Caroline Casey James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

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

itoggle caption Asa Mathat/TED

A direct, friendly gaze seems to help cement the bond of affection between people and their pooches. Dan Perez/Flickr hide caption

itoggle caption Dan Perez/Flickr