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Lighter is better than heavier
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Smaller is better than bigger
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Flexible is better than rigid
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Be resistant without compromis(s)ing durability
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Be secure! People will wear it: No Booms or Zaps!
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Energetic efficiency is a must
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Simple is better than complex (Borrowed from Zen of Python)
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Design is not just what is looks like and feels like. Design is how it works (Steve Jobs)
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Field tests, in Antartica, makes perfect.