A person holding a small plant with soil in their cupped hands. The plant has green leaves and is being presented against a neutral background. The person is wearing a gray top with lace detailing on the shoulders. The image suggests themes of growth and nurturing.

What is the hygiene hypothesis?

Are we all too clean for our own good? Being overly paranoid about cleanliness puts you at a disadvantage. Early exposure to ‘dirt’ is a good thing, so let children…