translation.en: The answer comes from a behavioral science experiment that was run one hot summer, 10 years ago, and only 90 miles from here, in San Marcos, California.
translation.zh: 答案来自于一个行为科学实验， 是十年前一个炎热的夏天进行的， 离这儿只有90英里地方， 在California的San Marcos。