University research has found out WHY mud play makes us happy. ‘Friendly’ bacteria activated a group of neurons that produce the brain chemical serotonin. Serotonin plays an important part in the regulation of mood and learning.
So it is not just it's connection to nature and the ancient world and the great sensory benefits and the fact that it feels fun that makes mud play so marvellous it is actually that there is a chemical in it that makes us feel happy as well!
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