Wildlife 'Red List' a grim tally of extinction threat

The world will get an update Saturday of the Red List of Threatened Species, the authoritative catalogue of how many of the planet's animal and plant species are teetering on the brink of extinction due to human activity.

How artificial intelligence is changing economic theory

A century of economic theory assumed that, given their available options, humans would always make rational decisions. Economists even had a name for this construct: homo economicus, the economic man.

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