Biology is probably easier to overcome than physics. That is, it might actually be more achievable to slow down the human aging process to a degree where the time in terms of generations is shortened because we all live far longer. Given how crazy that sounds, that should give you an idea of how impractical this interstellar travel stuff all is.
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"The great promise of the Internet was that more information would automatically yield better decisions. The great disappointment is that more information actually yields more possibilities to confirm what you already believed anyway." - Brian Eno
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