You don't have to travel, but I find extended travel to be a helpful tool for reexamining yourself and the constraints you've artificially placed on your life. It's easy to believe everything has to be done one way if you're always in one place around the same people.
Education is the art of making man ethical.
It bears mentioning that the Milky Way is only one of 150 billion galaxies visible to our telescopes - and each of these will have its own complement of planets.
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