Stephen Hawking, universally beloved scientist and one of the greatest minds of our generation, has died at age 76.

The theoretical physicist, best known for his work in cosmology (particularly with black holes), was both a visionary and an inspiration. Outside his vast intelligence (of which he was very modest, once saying that people who boasted about IQs were losers), he was also a study in resilience and perseverance.

At the age of 21, Hawking was diagnosed with amyotrophic lateral sclerosis (ALS). The disease progresses quickly, and Hawking was given only a short time to live, but he survived for decades and stayed mobile with use of a wheelchair.

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As any historian of medieval East Asia or player of Civilization V: Brave New World will tell you, 15th century Koreans were really, really, really good at science.

A statue of King Sejong the Great in Seoul. Thanks, guy! Photo by Republic of Korea/Flickr.

Under the judicious rule of Sejong the Great, the kingdom's top researchers spent a lot of time looking at space and making maps of it.

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The Earth has survived some serious catastrophes. Here are the 4 worst.

Our planet's had a bit of a rough past. But the Earth is nothing if not a survivor.

Here are the four worst things the Earth has survived so far:

1. The Big Splash, aka that time the universe punched Earth in the face and may have created the moon

Imagine a young Earth. Like, super young. Only 20 million years after the solar system even formed. A little precious baby Earth.

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