Bioluminescence of the Human Body

Humans are bioluminescent. We literally glow, but the light is 1,000 times less intense than the levels to which our eyes are sensitive. This occurs due to metabolic reactions within our cells. Japanese scientists have captured images of human bioluminescence and found that the amount of light emitted follows a 24-hour cycle, with the brightest light being emitted from the cheeks, forehead, and neck, but these areas did not correspond with the brightest areas on thermal images.