All without once touching a calculator. There's no end to what you can do. With Tutor-Tech, you can create a stack on 17th Century Art and follow it with stacks on the 18th, 19th, and 20th. Your stacks are your property and you can exchange them with colleagues. Just copy them with a file utility and sell, trade, or give them away.
Students can create stacks, too.
In fact, students are great authors and they learn better from each other. Call for details. The Stack Exchange Magazine is a major resource which reviews hundreds of commercial and public-domain stacks. You can order right out of the SE and, if you like, tailor stacks with Tutor-Tech. Right now, there are thousands of innovative people like yourself who trade stacks, and hundreds of stack developers with commercial stack products.