Chinese scientists develop camera to spot potential suicide bombers

From religious extremists wielding knives in train stations to crowded buses being set on fire, attacks in public places in China have led to security fears on the mainland.

And now a new camera aims to pick out people showing signs of high levels of stress before any potential suicide bomber could strike.

Unlike existing devices to measure stress, which look at heart rate, facial expression and body temperature, the camera will assess the level of blood oxygenation – something that unlike your heart rate, you can’t learn to control.