Above is a video of a digital adder that uses water instead of electrons. I know Boolean logic and binary math so I understood how the binary addition worked. I'm not sure how easy it would be to understand if you didn't know that stuff, but it is interesting.
It is amusing that humans, it seems, unable to devise anything really new in such realms as world-view, ethics or religion, they only unknowingly reproduce the old ones with some modifications. For example, Leftist world-view for last 200 years (Marxism, Communism, Trotskyism, Stalinism and all varieties of Socialism) was and still is a combination of the two many-centuries-old heresies: Pelagianism and Manichean. Even the most zealous neocon, Christopher Hitchens, still follows this combination, replacing the original sin (capitalism) of his previous Trotskyist faith by a new enemy - Islam. He wants us to wage a Crusade against it, but not in the name of God, but in the name of secular New Enlightenment. A ridicule proposition: where can he hope to find enough true believers for that? To win an all-out religious war, one needs to be no less religion motivated and fanatical than his opponent. Atheism is not a weapon, but a fatal weakness in such a battle.
Islam, too, is a Manichean delusion, but combined not with Pelagianism, but with Calvinism in its most pessimistic and antihuman form.
