Thanks for stopping by for Day 19 of Upworthy's 31 Days of Happiness Countdown! If this is your first visit, here's the gist: Each day between Dec. 1 and Dec. 31, we're sharing stories we hope will bring joy, smiles, and laughter into our lives and yours. It's been a challenging year for a lot of us, so why not end it on a high note with a bit of happiness? Check back tomorrow (or click the links at the bottom) for another installment!

You've heard of the circle of life. (And now you're singing it. It's the ciiiiiiiircle of liiiiiife! You're welcome.)

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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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Most Shared

The North Pole was once one of the most inaccessible places on Earth.

Robert Peary's 1908 expedition to the Arctic. Photo by Hulton Archive/Getty Images.

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Heroes

The North Pole is famous for many things. 24-hour darkness, polar bears, and of course, being the home of Santa Claus.

One thing it's definitely not known for, though, is balmy, casual, "Hey, how cold is it? Do you think I need a light jacket?" type temperatures.

The north pole is freezing. It's one of the coldest places on Earth. In fact, it's sometimes colder than Mars. Mars!

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Heroes