Evidence of the best sites in the world said the world was flat and in 1492 all that changed and we found that the world is round so your people who thought the world's one 4091 no thought with what the science. Was telling them to think and so you sometimes a scientist long and sometimes the sciences and as up-to-date as any being maybe someone just hasn't hasn't come up with. That perfect study design for whatever may be your fortunately for for a few things like where I treatments and for sealants you know we have really really really good sound science. On that and the rest the sciences, catching up and get there pretty quickly but for some things you we probably won't have great signs on for a long time and such as a matter staying up on top.
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