CNN News:最新研究显示人体平均正常体温降至37℃以下

What is one thing that all poikilotherms have in common? Are they all fish, for-legged, cold-blooded or endothermic? Poikclotherms have variable body temperatures, they're considered cold-blooded.
So with our relatively high unchanging body temperatures you and I are considered warm-blooded, most of us anyway. But how warm, since a German doctor took the temperatures of 25,ooo patients in the mid-1800s. It's been accepted that normal human body temperature is 98.6 degrees Fahrenheit.
But now, a few studies are indicating that's no longer true. The most recent one, published by Stanford University found that our bodies actually average a temperature of 97.5 degrees Fahrenheit.

Researchers looked at Americans records dating back to the U.S. Civil War. And they didn't find that the old average was wrong. They found that our bodies are somehow cooling down with each new generation. Scientists aren't sure exactly why. Something it's because we spend more time in heat and air conditioning than our ancestors did, and they don't know if this means anything good or bad related to our health. But it is possible that the old 98.6 degrees benchmark is now more than a whole degree too high.