A measure of tactile acuity defined as the smallest separation at which two points applied simultaneously to the skin can be clearly distinguished from a single point. It varies from 1 or 2 millimetres in the finger pads and tongue to more than 60 millimetres on the upper arm, upper thigh, and back.
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For some reason I think I'm one for being depressed, is there anyone like me?
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Oxygen is one product of photosynthesis.
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??? is the fifth?
