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Researchers in Sweden found that children living in families that hand-washed their dishes were about 40 percent less likely to develop allergies compared with kids in homes that used a dishwasher, said study researcher Dr. Bill Hesselmar, an allergist at the University of Gothenburg Department of Pediatrics. The researchers said they suspect that hand-washing dishes doesn't get them as clean as the dishwasher does, which is actually a good thing because it can help protect against allergies by exposing family members to more bacteria.
http://www.huffingtonpost.com/2015/02/23/hand-washing-dishes-benefits_n_6736636.html

Бонус: For years, parents of babies who seem likely to develop a peanut allergy have gone to extremes to keep them away from peanut-based foods. Now a major study suggests that is exactly the wrong thing to do.
http://www.mercurynews.com/science/ci_27585189/peanut-exposure-helps-prevent-kids-allergies-study-says