Matt and Jackie have three differently-colored keys and knobs. They need to use one combination of key and knob to open the door. They organize all of the available combinations into a grid of possibilities and calculate that they have 9 total combinations. As they attempt each combination, they mark down which combination was used until they find the working one.
Sophie answers the question, "what is a computer?" She uses an analogy involving a person at a desk to illustrate how computers process information and discusses the different components in a computer, such as a hard drive, memory, and a processor. She then talks about binary, the language of computers