What a good control can tell us
Silent captioned film. Concept artwork, not experimental footage.

00–07 seconds: EXPLAINER / 01
What else could produce the response?
Possible contributors include biology, electrode chemistry, stored charge, temperature differences and instrument artifacts.

07–14 seconds: EXPLAINER / 02
Match the setup. Change the question.
Use organism-free blanks and controlled light/dark comparisons. Document temperature, electrode preparation and instrument behavior.

14–21 seconds: EXPLAINER / 03
Repeat preparations. Keep every result.
Independent preparations—not thousands of timestamps—test repeatability. A light response alone does not prove a biological mechanism.