There all kinds of smells around us, and some of them have an important secret meaning. Does your house smell like the gym locker all of a sudden? There might be some bacteria growing in your heating, ventilation, and air conditioning system. When you order a drink that isn’t supposed to have cinnamon in it but still smells like it - someone might have messed with it and tried adding some ingredients that shouldn't really be there. Some smells only seem dangerous but are perfectly normal.

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