We often make lists of the best inventions of all time. But which are the worst?
The nuclear bomb would be up there. The AK-47 Kalashnikov assault rifle also has a particular claim to infamy. The World Bank has estimated that there are about 75m such guns in circulation, causing tens of thousands of deaths a year.
But one other invention has killed many, many times more people than both of those weapons put together: the motor car.
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