Cleve Backster was a lie-detection expert who trained CIA interrogators. He spent his career reading the signals of human deception.

One February night in 1966, out of curiosity, he clipped the electrodes of a polygraph machine to a plant and watered it. To his surprise, the plant responded.

The electrical signature was similar to what he had seen countless times before, resembling how a person would feel when they are happy or excited. The plant was apparently happy after being watered.

Backster considered burning a leaf to see the plant’s reaction. Even before he struck a match, however, the polygraph needle jolted across the page, tracing a line similar to the human response to fear or stress.

Backster wanted to run out into the street yelling, “Plants can think!”

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