From a young age we are taught we have five senses: a universal 'truth' born from the works of ancient Greek philosopher Aristotle. But it's not quite that simple. PRECISELY HOW MANY senses we have depends on how we define them, and it's far from an exact science. For example, the number could be as small as three if we count physical categories of incoming information (mechanical, chemical and light), or it could run to hundreds or thousands if we count types of receptors in the human body. Sensory expert John Henshaw of the University of Tulsa, Oklahoma, thinks we may have nine senses, adding balance, temperature, pain and proprioception (awareness of the position and action of the parts of our body) to Aristotle's original list of sight, hearing, smell, taste and touch.
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