The Internet, a bottomless sea of information and ideas, had profound effects on the diffusion of knowledge, and especially on its speed and reach, both of which were accelerated by smartphones. If not so significant to human history as the taming of fire, it was at least as significant as the invention of the printing press. It accelerated scholarship, science, medicine, and education; it aided commerce and business. But in its first two decades, its unintended economic and political consequences were often dire. Stability, in American politics, had depended not on the wealth of the few but
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