Jason Johnson: It makes a difference to America's racial politics that all of the officers involved in the killing were black, as was the victim Tyree Nichols. We have seen some protests in American cities after this killing but they've been relatively muted and almost entirely peaceful," he says. "Putting the race angle aside, then it does seem to suggest a sort of a culture of impunity"
The response to the death of the 29-year-old has differed from that of previous cases of police killings; we ask what the tragedy indicates about how America deals with police violence. Our correspondent says a lawmaker’s murder in Afghanistan highlights the misery of women under the Taliban. And why a decades-old model of animal and human learning is under fire.
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