The Greek philosopher Pythagoras was not the first to discover the equation expressed in the Pythagorean theorem, as it was known and used by the Babylonians and Indians centuries before him. He may have been the first to introduce it to the Greeks; the first record of it being mathematically proved as a theorem is in Euclid's elements which was published some 200 years after Pythagoras, so he could have been the first to prove the theorem.I don't think that there is a misconception here.
The Pythagorean theorem is named after Pythagoras, but he was a Greek who lived 2500 years ago, and no one know what he exactly did.
Ancient Babylonians and Indians had examples of right triangles with a2+b2=c2, but they did not have the theorem. As far as we know, only the Greeks invented mathematical proofs.
Babylon and India were doing arithmetic. Greece was doing real mathematics.
Speaking of math, Numberphile has a new video on 10272,000 universes in string theory, more than previously announced. In the middle it casually mentions that they all have negative energy, and are therefore unphysical. Ultimately this is what string theory will be famous for.