盖勒普博士说， 当受试者花五分钟呆在户外让他们的身体有机会感受温度的变化后，这种反应表现的尤其强烈。
The effect was especially strong after participants had spend five minutes outside and their bodies had had a chance to sense the change in temperature, Dr Gallup said.
关于根除天花的两本优秀的书是D.A. Henderson博士的《天花：疾病的死亡》和另一位天花斗士Bill Foege博士的《着火的房子》。
Two excellent books on the smallpox eradication are Dr. D.A. Henderson's smallpox: the Death of a Disease and the forthcoming House on Fire by another key smallpox warrior, Dr. Bill Foege.
如果你还没有了解到布朗纳博士和他的使命，请花一些时间。
If you haven't learned about Dr. Bronner and his mission, please take the time.
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