피톤치드(phytoncides)
Way back in 1956, the Leningrad biologist Professor Boris Tokin demonstrated that conifers did a good job disinfecting their surroundings. He discovered that the air around stands of young pines was almost germ-free. The cause of this clean air was the trees themselves, which were giving off phytoncides, a kind of plant antibiotic. Why do conifers to this? The answer is that they are constantly being attacked by an enemy we cannot see, one that drifts in the breeze. Every…