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How hot does water need to be when you wash your hands?

It has long been supposed that hot water works to get bacteria off your hands better than cold water. But the hot water needed to kill bacteria is way too hot to be comfortable to use when washing your hands.

Luckily, studies have proven that hot water is not necessary to use while hand washing. In fact, in a 2005 study documented in the Journal of Occupational and Environmental Medicine, participants were instructed to wash their hands in water ranging from 40 degrees all the way up to 120 degrees. What the study found is that the temperature of the water doesn’t really matter when it comes to getting your hands truly clean.

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The Richest, Fattest Nation on Earth (It’s Not the United States)

This Connecticut-sized nation, sticking out like a loose tooth in the Persian Gulf, is one of the most obese nations in the world, with residents fatter, on average, than even those of the United States, which often takes the cake in such competitions.

According to recent studies, roughly half of adults and a third of children in Qatar are obese, and almost 17 percent of the native population suffers from diabetes. By comparison, about a third of Americans are obese, and eight percent are diabetic. Qatar also has very high rates of birth defects and genetic disorders — problems that, along with the prevalence of obesity (PDF) and diabetes, have worsened in recent decades, according to local and international health experts.

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