The battery terminals are represented as electron-source and electron-sink in the user interface of the models. The function of this variable is to stop the model once a certain number of electrons reach the battery positive, and a monitor displays the time taken to fill the electron-sink.
Australia faced the threat of communism after WWII ended in 1945. The threat was known as the Red Menace which was caused by all the conflicts in Asia and also things that were going on in Australia at the time. The Australian government responded to the Red Menace in many ways.
This led to the peaceful reunification of Germany in 1990 and the end of communism in Eastern and Central Europe. In December of 1991, two years after President Reagan left office, the Cold War ended when the Soviet Union was dissolved. President Reagan's prediction of the collapse of Soviet communism had come true.