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Sending large numbers of people to explore and settle Mars in the decades ahead isn't inevitable, but it is entirely possible. The biggest challenge isn't the engineering and spacecraft, however difficult they may be. Instead, it's making sure that a sustained Mars campaign proceeds as a national priority, and that will happen only if the American people are behind it. We have the opportunity now to make this happen. We might not be so fortunate in the future.

In terms of the Internet, it's like humanity acquiring a collective nervous system. Whereas previously we were more like a... collection of cells that communicated by diffusion. With the advent of the Internet, it was suddenly like we got a nervous system. It's a hugely impactful thing.