For millennia, people have been reporting stories of mysterious spheres of light that glow, crackle, and hover eerily during thunderstorms. They’ve been spotted in people’s homes, and are even said to be able to pass through windows. No one knows how ball lightning forms — but that’s not stopping scientists from attempting to recreate it in their labs.

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When scientists examined the DNA of ancient bones found near a Himalayan lake, they were forced to confront a seemingly impossible conclusion.

*This episode has been updated. In the original version, we mixed up carbon isotopes with carbon isotope ratios.

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Sixty years ago, geologists tried to drill down through the Earth’s crust to pull up a piece of the Earth’s mantle. Their mission didn’t go exactly as planned. But it sowed the seeds for a new field of science that’s helped us rewrite not only the history of the planet, but, potentially, our definitions of life itself.

The documentaries featured in this episode are "The First Deep Ocean Drilling: Mohole, Phase 1" and "Project Mohole: Report No. 1."

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Believe it or not, scientists still don't know how the sense of smell works. But they're looking at how powerful it is - dogs can actually sniff out cancer and many other diseases - and they're trying to figure out how to reverse engineer it. In fact, one MIT scientist may have built a robot nose ... without completely understanding how his invention works.

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Article on quantum nose theory: https://bit.ly/3clurfs

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Scientists all over the world are searching for dark matter: an invisible, untouchable substance that holds our universe together. But they haven't found it. Are they chasing a ghost?

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Scientists don’t know what 95% of the universe is made of. They don’t know how a bike stays up. They don’t even really know how the nose works. Join us every Wednesday on Unexplainable for deep dives into the unknown, because what we don’t know is awesome. New episodes March 10th.

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