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There is some evidence, for example, that cooler body temperatures can cause people’s internal clocks to click at a slower rate. One experiment found that divers immersed in 39-degree sea water estimated a 60-second interval to pass more than 10 percent faster than they did before entering the water. Other studies have found that people with high fevers perceive the clock to move slower than it actually does (they overestimate intervals of time). These findings raise the possibility that people in warmer places are operating on [ faster / slower ] internal clocks.