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    Man-made vs natural flight

    In simple terms (if possible), why is an aircraft unable to achieve the manoeuvrability of a bird, eg, immediate stop, rapid acceleration, sudden change of direction? I'm guessing it relates to necessary strength and rigidity of the plane's structure, engine power/weight ratio.
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    Defeating evolution

    Life forms adapt, and thereby strengthen, by countering detrimental influences. Given that man is increasingly less dependent on his (natural) body defence mechanisms, and more reliant on (unnatural) man-made solutions (pharmaceuticals), is it the logical conclusion that the biological...
  3. H

    Essential diet

    Which specific foods are vital for long-term health/survival?