1938 – 2018 · A portrait
A German biophysicist who coined the term 'biophoton' in the 1970s, arguing the faint light cells emit is coherent and coordinates activity through DNA — a claim most biophysicists still dispute.
The line above is how his claims were received — by the scientists whose job was to doubt them. It rises as a claim is tested and accepted, and the room brightens with it. It is not a verdict on truth: some accepted ideas are later overturned, and some rejected ones come back. A hollow point is a claim still open.
Cells and tissues were found to give off extremely faint light, too weak to see; a Russian biologist reported something similar in 1923, and sensitive detectors confirmed the effect from the 1950s onward. The measurement itself has never been disputed.
Popp coined 'biophoton' and went further: he argued the light was coherent, like laser light, originating in DNA and coordinating activity between cells. Most biophysicists accepted the glow but not the coherence or the signaling claim built on it.
Biophysicist Michal Cifra and colleagues reviewed the evidence in the Journal of Luminescence and confirmed ultraweak photon emission as well established, but found no reliable evidence for the coherence Popp had claimed, nor for any confirmed signaling role.
The faint glow remains a genuine, measured phenomenon studied in laboratories worldwide. Popp's coherence and DNA-signaling claim remains a minority position, without an accepted mechanism or a confirmed replication of his strongest results.