The best way to predict the future is to invent it," the famed computer scientist Alan Kay once said. Uttered more out of exasperation than as inspiration, his remark has nevertheless attained gospel-like status among Silicon Valley entrepreneurs, in particular a handful of tech billionaires who fancy themselves the chief architects of humanity's future. Sam...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. Tech billionaires are making a risky bet with humanity's future Sam Altman, Jeff Bezos, Elon Musk, and others may have slightly different goals, but their grand visions for the next decade and beyond...