This presentation introduces Pervasive Parentheses, a high school CS project in which small teams of students explore a mysterious expression language composed of only digits and parentheses. The empty string is an expression with value 0, digits are expressions with the same value as the digit, concatenating expressions adds the values, and putting an expression in parentheses doubles its value. All other strings are invalid. Students get a taste of computer science research by asking and answering questions about the...