Edmund Schulman in the 1950s had been studying trees under great stress at Timberline, and came to the realization that he put in an article in Science magazine called, "Longevity under Adversity in Conifers."
Edmund Schulman在1950年代 他在Timberline公司用高压研究这些树木 最后推出一理论，在《科学》杂志上写一文章公布其结果。 题为“困厄铸就长寿——针叶树的研究”