Artificial intelligence and machine learning exist on the back of a lot of hard work from humans.
Alongside the scientists, there are thousands of low-paid workers whose job it is to classify and label data - the lifeblood of such systems.
But increasingly there are questions about whether these so-called ghost workers are being exploited.
As we train the machines to become more human, are we actually making the humans work more like machines?
And what role do these workers play in shaping the AI systems that are increasingly controlling every aspect of our lives?
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