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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Expression of Emotion in Man and Animals by Charles Darwin: The face, therefore, will have been subjected during many generations
to much closer and more earnest self-attention than any other part
of the body; and in accordance with the principle here advanced
we can understand why it should be the most liable to blush.
Although exposure to alternations of temperature, &c., has probably much
increased the power of dilatation and contraction in the capillaries
of the face and adjoining parts, yet this by itself will hardly
account for these parts blushing much more than the rest of the body;
for it does not explain the fact of the hands rarely blushing.
With Europeans the whole body tingles slightly when the face
blushes intensely; and with the races of men who habitually go
 Expression of Emotion in Man and Animals |