The post-war generation reaped the benefits of peace and prosperity. Yet rather than spend that bounty, retired boomers are hoarding their riches–and upending economists’ expectations. The science of menstruation is baffling, partly because most animals don’t do it. Now clever innovations may help improve women’s health (9:13). And how old-fashioned wind-power is blowing new life into the shipping industry–and cutting its emissions (16:13).

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