Don wan: Harris keeps Trump tame

The vice-president turned in a confident if imperfect performance, leaving Donald Trump flustered. But will it change anything? A global shortfall of blood plasma is hampering the development of new medicines; we argue for some simple market forces that could plug the gap (11:40). And how Nigerians are slimming their legendarily lavish weddings amid a cost-of-living crisis (18.10).

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