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Plants can communicate, although not in the same way we do. Some express their discontent through scents. You know that smell that hangs in the air after you’ve mowed the lawn? Yeah, that’s actually an SOS. Some plants use sound. Yes, sound, though at a frequency that we can’t hear. Researchers experimented with plants and microphones to see if they could record any trouble calls. They found that plants produce a highfrequency clicking noise when stressed and can make different sounds for diffe