What is Elon Musk's brain microchip company, Neuralink？ What we know.

Elon Musk is the CEO of Tesla and SpaceX.

When he's not busy running those companies, he's also the CEO of Neuralink — a neurotechnology startup that plans to implant devices into human brains starting in 2020.

For the first time on Tuesday night, Musk and colleagues unveiled Neuralink's plans for the future.

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Elon Musk is a busy man.

When he's not digging a tunnel underneath a major city to try and create a new form of transportation, or starting a major car manufacturer, or trying to move the human species to Mars, he's running a company that intends to implant computer chips into human beings.

That company is named Neuralink, and you're forgiven if you've never heard of it — since being announced in 2016, not much has been said about the San Francisco-based startup. But an event on Tuesday evening starring Musk himself offered a deep look into what to expect from Musk's next huge venture.

Here's what we learned: