Words are not facts. But words may be more effective in winning hearts and minds than sticks and stones and broken bones. And so the people in the Square are extra-vigilant against dangerous words. A person may look harmless but he or she may be an enemy. Islam Ashraf, 24, a protester, believes there are infiltrators and spies around him. "It's people dressed like me, but I know they are people pushed by the [ruling] party." How? "When I hear someone talk and push politics, I know which party he's from." Mahmoud from the museum can tell as well. It is all, he says, in "the way you talk."