Even after half a lifetime studying polar bears in some of Earth's least hospitable climates, Andrew Derocher still gets nervous trying to tag a 1,000-pound bear on a frozen slab of ice in the open water.

"[The bears] are not worried about being out there, but it’s just not good enough for us," he says.

Photo by Andrew Derocher.

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Heroes

When Richard Krishfield began his career fixing office equipment, he had no idea it would take him to the ends of the Earth.

Then, in 1986, Krishfield, who had spent years working on computers and electronics for businesses, was asked down to the Woods Hole Oceanographic Institute (WHOI) in Massachusetts to work on one of their instruments — a conductivity, temperature, and depth (or CTD) device that collects data from its seat on the ocean floor.

It wasn't the work Krishfield was used to, but it offered an intriguing promise of adventure.

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If you're 30 years old, you've seen a good amount of change in your lifetime. Over the years you've gone from child to teenager to real adult. You've worked your way through the trials and tribulations of first steps, first crushes, and first jobs. You went to school, got jobs, and grew up. It's the start of an immense and grand story.

But you're not the only thing changing in this story. As you've grown, the background has changed too. Sometimes it's obvious — like moving to a new house or a new city.

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Heroes