But the flow from the stem tip prevents them from doing this.

VOA: special.2009.10.13

Study the best and as one of the students here, Mariam -- came to me after the class and she said, " "the tip of the stem is actually about democratizing excellence."

研究最好的，正如Mariam同学-,课后找到我时说的，“流行学术其实是要将杰出大众化“

哈佛公开课 - 幸福课课程节选