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The birth rate of unicorns\u2014firms with a valuation north of $1bn\u2014has plummeted, and prior investors in them are eyeing what exits exist. We ask why the species is endangered. The struggle to finance and build homes is contributing to a profound housing crisis in sub-Saharan Africa (08:34). And the return of Parler, a darling social-media platform for America\u2019s far right (17:56).

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