Every theory presented as a scientific concept is just that; it's a theory that tries to explain more about the world than previous theories have done. It is open to being challenged and to being proven incorrect.
“The fame of heroes owes little to the extent of their conquests and all to the success of the tributes paid to them.”
“But I really believe it is in America's interest as well as that of the free world more generally to stop Iran from getting its hands on nuclear weapons. This regime has threatened to wipe Israel off the map and bring about a world without America, and either of those is a really bad prospect.”