*Watch Online/In person*: Early computers were either designed to do one thing or, if they were programmable, they would be loaded-up with the program, it would run, and then a new program would be run. But a modern computer gives the appearance of doing multiple things at once. This lecture shows that in reality it is a supreme juggling act and, like a plate-spinning act, should be accompanied by The Sabre Dance amazement and applause.