Today some physicists are working on a [[quantum theory of gravity]] (the "theory of everything"), including [[string theory]]. Critics increasingly point out that [[string theory]] is largely untestable and unfalsifiable, and thus potentially unscientific under the principles of science advanced by [[Karl Popper]]. | Today some physicists are working on a [[quantum theory of gravity]] (the "theory of everything"), including [[string theory]]. Critics increasingly point out that [[string theory]] is largely untestable and unfalsifiable, and thus potentially unscientific under the principles of science advanced by [[Karl Popper]]. |