Created by:   Duke University

How To PassPass all graded assignments to complete the course.
User Ratings
4.5 stars
Average User Rating 4.5See what learners said

How It Works

Each course is like an interactive textbook, featuring pre-recorded videos, quizzes and projects.

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Help from Your Peers

Connect with thousands of other learners and debate ideas, discuss course material, and get help mastering concepts.


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Duke University
Duke University has about 13,000 undergraduate and graduate students and a world-class faculty helping to expand the frontiers of knowledge. The university has a strong commitment to applying knowledge in service to society, both near its North Carolina campus and around the world.
Ratings and Reviews
Rated 4.5 out of 5 of 54 ratings

Excelent second part, very useful. Hoping to complete all 4 parts.

Great explanations for most subjects. The tests are significantly more complicated than the excercises covered by the lectures.

Would've liked more on the truth table of the conditional.

A good continuation of Think Again I. However, final quiz had lots of bugs in it.