A medical test is 99% accurate. You test positive. How worried should you be? Almost everyone gets this spectacularly wrong. Discover why rare events fool your brain and rebuild your intuition from scratch.
The 99% Test That's Usually Wrong is a free, interactive intermediate-level general lesson covering general. Designed for all levels, this 15-minute lesson includes 43 interactive questions with immediate feedback to help learners master key concepts.
This lesson takes approximately 15 minutes to complete. It includes 43 interactive questions with immediate feedback.
Created by
Adam Al-Masri
Lesson preview
The first screen gives learners a clean start, and the full lesson opens directly from here.
Questions preview
43 questions
Warm up with the main general idea
Short answer
Identify the most important concept
Short answer
Apply general thinking to a real example
Short answer
Check your reasoning with a quick challenge
Short answer
Lesson details
What to expect
Yes! This lesson is completely free to access. No account or payment required. Just click "Start Lesson" to begin learning.
Absolutely! Teachers can share this lesson with students using the share button. You can also create a live session to track student progress in real-time.
Adam Al-Masri
Review the strongest explanation
Short answer
Finish with a confidence check
Short answer
