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Moves to shutter the president\u2019s accounts and to crimp corners of the internet given to right-wing extremism raise thorny questions, both about free speech and social-media firms\u2019 business models. Our public-policy editor takes a broad look at girlhood: how women\u2019s adolescence has changed for the better but is challenged mightily by covid-19. And science\u2019s bid to save more snake-bite victims\u2019 lives.

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