Breathing releases another gas, carbon dioxide, which is exhaled by gorillas, humans and fish ... is the main reason why people can't breathe underwater (Getty Images) ...

The seals’ ability to detect the amount of oxygen in their blood may help them make diving decisions and avoid drowning.

Dogs are acting as testers," Davydov said. The liquid breathing technology entails filling human lungs with liquid rich in oxygen, which gets into the blood system. The Advanced Research Fund’s ...