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after scientists discovered that deep-sea dragonfish had chlorophyll in their eyes, the US Pentagon began funding research for inexpensive night-vision eye drops.

In the 1990s, marine biologist Ron Douglas of City University London discovered that, unlike other deep-sea fish, the dragonfish Malacosteus niger can perceive red light. Douglas was surprised when he isolated the chemical responsible for absorbing red: It was chlorophyll. “That was weird,” he says. The fish had somehow co-opted chlorophyll, most likely from bacteria in their food, and turned it into a vision enhancer.

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