10 years ago, JP Caudill couldn't run a mile. Recently, he ran seven marathons in seven days across all seven continents.

By the time we hit 30, many of us are wrapping up whatever athletic accomplishments we'll ever set out to achieve. Caudill was just getting started.

"I knew running was something I was bad at and didn’t enjoy," Caudill said. "So, I just a set a goal of one mile on the treadmill at the gym."

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These images are basically like downloading a National Geographic magazine straight to your brain.

Every year, the Siena International Photo Awards brings together some of the world's most amazing photographers. Their mission? Use the power of the photograph to encourage a greater understanding of the world's places, populations, and people.

2017 saw thousands upon thousands of entries from photographers all around the world, and in October, the judges announced their winners. From sleepy bears to quiet treks across the snow, each of these images captures something astounding, magical, true, or important about the world.

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Paris' romantic air just got more breathable, and its world-famous streets more stroll-able.

The city's government unveiled an ambitious plan to ban gas-powered cars from the city by the end of the next decade.

"We have planned the end of thermic vehicle use, and therefore of fossil energies, by 2030," Christophe Nadjovski, Paris deputy mayor in charge of transportation, told France Info radio.

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One and a half million volunteers planted a record-shattering 66 million trees in India on July 2, 2017.

The campaign took place along the Narmada River in the central Indian state of Madhya Pradesh. Volunteers young and old gathered together to plant more than 20 different species of sapling.

This top's India's 2016 record, which saw 50 million trees planted.

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Heroes