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And while we are at it, why does NASA rely so heavily on glue to keep the heat shielding tiles on the space shuttles. Everyone knows that glue wears out eventually on earth, no matter what type it is, but putting any sort of glue or epoxy through the stresses and strains of space flight should be a no-brainer. The stuff is going to wear out and should not be used. How about bolting down those shields? Seems to me that should be more permanent than glue, no matter what type of glue it is.