Now you know

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Researchers found women who regularly wore high heels for extended periods suffered more aches because their muscles were overstretched and could not relax.
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They found that wearing a pair of shoes shortened fibres in their calve muscles as the heel of the foot was elevated.
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The scientists at Manchester Metropolitan University then discovered the Achilles' tendon became thicker and stiffer meaning it was harder to stretch the feet out to walk.
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They said it could explain why women could wear high heels for hours but experience feet aches after removing them.
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In their study, published in the Journal of Experimental Biology, the team used volunteers aged between 20 and 50 who had regularly worn 5cm high heels for two years or more.
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They tested a final group of 11 who felt uncomfortable walking without their heels and recruited a second group of women who did not wear high heels.
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Using ultrasound to measure the length of muscle fibres in the women's calf muscles, they found high heel wearers were 13 per cent shorter than those who wore flat shoes.
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This confirmed the hypothesis that when you place the muscle in a shorter position, the fibres become shorter, said Prof Marco Narici, who led the study.
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It was found that the Achilles' tendon was the same length in the two groups, but in women who wore high heels it was much thicker and stiffer, making it harder for them to stretch their feet out when they were on the flat.
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But this problem can be overcome by doing simple stretching exercises throughout the day.
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If the wearer stands on tip toes and lowers their heels up and down again it will stretch out the tendons making it easier to walk without heels,.
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If this is done about 20 times a day it should be sufficient to prevent this happening.
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Andrew Hough - Telegraph
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This of course is ignoring the architecture of the shoe being worn............
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Some of which defy logic in terms of their shape and form
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Never mind women will seemingly endure great discomfort to achieve a certain look