All living things emit a faint glow. Could this light be useful?

TL;DR - A Nature article examines ultra-weak light emitted by living organisms and its potential biological uses. These “biophotons” might aid disease diagnosis or represent an undiscovered cellular signalling mechanism.

• Living organisms emit extremely faint photons.
• Emission patterns could potentially serve as disease biomarkers.
• Cellular signalling via biophotons remains a hypothesis, not an established mechanism.