Today, at the United Nations, something incredible might happen: President Obama may grab the hand of new Iranian president Hassan Rouhani and move it up and down a few times. Observers believe that this simple symbolic act of friendship — the first contact between an American president and an Iranian president since Iran’s 1979 revolution — would “rank as a landmark encounter” and could even “shake the world.” If it happens, the gesture will join a number of other famous handshakes that the world will never forget, or will probably forget but not for a while at least. See how many you can identify based solely on the hands of the participants.
