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The Immune System - Human Body Detectives

These facts were news to Merrin, Pearl and Sam, so they wanted to share them with you. Did you know that... laughing lowers levels of stress hormones and strengthens the immune system? 6-year-olds laugh an average of 300 times a day and adults only laugh 15 to 100 times a day? it is impossible to sneeze with your eyes open?

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