This is a post from Wait but Why which took forever to write. The post is as long as Old Man & the Sea, well almost. But, if you want to understand (really understand) what Elon Musk is up to these days and understand human brain better as a bonus, please invest some time reading it.
Not only is Elon’s new venture—Neuralink—the same type of deal, but six weeks after first learning about the company, I’m convinced that it somehow manages to eclipse Tesla and SpaceX in both the boldness of its engineering undertaking and the grandeur of its mission. The other two companies aim to redefine what future humans will do—Neuralink wants to redefine what future humans will be.
The mind-bending bigness of Neuralink’s mission, combined with the labyrinth of impossible complexity that is the human brain, made this the hardest set of concepts yet to fully wrap my head around—but it also made it the most exhilarating when, with enough time spent zoomed on both ends, it all finally clicked. I feel like I took a time machine to the future, and I’m here to tell you that it’s even weirder than we expect.
Needull in a haystack 
Just another thing to add to his long list of accomplishments– what an interesting guy
http://fundersandfounders.com/how-elon-musk-started/
Thanks for the link. Truly inspiring guy. His thoughts seem to begin where thoughts of common people like me end.