No, everything they believe is considered provisional knowledge. Science by design requires that all knowledge could be inaccurate and subject to revision if new data comes to light. The classic example is Newton's law of gravity. Was newton correct in his law? To a certain degree of accuracy he was. However as we gained knowledge we found that there were some errors cropping up when we used more accurate measurements. Einsteins theories explained the discrepancy. Scientists must always be open to new knowledge overturning previous ideas. There is no "Ultimate Truth" in science.
Agreed.
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