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Why do human beings produce tears in reponse to emotional stress? This question began to intrigue Dr. Frey in 1972. It wasn’t until 1979 that he had time and funds to pursue his hunch. Frey confirmed an earlier discovery that emotional tears are chemically differ
Why do human beings produce tears in reponse to emotional stress? This question began to intrigue Dr. Frey in 1972. It was not until 1979 that he had time and funds to pursue his hunch. Frey confirmed an earlier discovery that emotional tears are chemically differ