Welcome to QNA! Course material is displayed to the right: readings, videos, questions, and so forth.

For questions, please enter your answer, then hit “Check Answer.” Each question is separate: you can answer a few of them any time you have time, and do the rest later.

Some questions are practice questions, while others are graded. Once you've answered a graded question, your score will appear at top right: ✓ for full credit, ½✓ for half credit, or ✗ for no credit. You get full credit for getting a question right on the first try, and half credit for getting it right eventually.

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