The sense of smell is one of our oldest senses, playing an extraordinary role in our daily lives. The perception of scents and odors not only affects our understanding of our environment but also shapes our emotions and memories. It is particularly interesting how multifaceted the relationship between smell and behavior can be, and how much information it can carry about various conditions, such as autism. New research suggests that early diagnoses can be established through smell, which could revolutionize the screening and treatment of autism in children. During the perception of odors and scents, we often do not even realize the distinctions we make. People instinctively sniff pleasant scents…