What i gather is that we should all get fat, because although the result of an instant stop would be flying further through the air, the extra fat will act as a cushioning device, not altogether unlike airbags, cushioning the impact and providing slower deceleration...
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"