Rats are not only clever animals, but they're also trainable. In Tanzania, they've been taught to help diagnose patients with tuberculosis by detecting early signs of the virus in human saliva. Tuberculosis is one of the deadliest diseases in the world. Every year, it kills half a million people in Africa alone. So researchers at this social enterprise lab are trying to tackle the problem. They're using these giant rats to detect early signs of the virus in human saliva. The rats are trained to identify positive samples of the disease by pausing with their nose in this hole. And every time they identify a positive sample, they get mashed banana as a reward. What would take a human scientist a whole day to diagnose, takes a rat a mere seven minutes. And they're also extremely accurate.

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