Tripoli threat: a warlord’s bid to take Libya

As rebel forces advance on Tripoli and American troops withdraw, we look at the Libyan general leading the march, and at the country’s fractured politics. There’s evidence that Facebook’s advertisement algorithms discriminate on the basis of race and gender. But who’s to blame, and how to fix it? And, the tricky business of making slot machines appeal to a generation of gamers.

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