Lesson 2 of 11
What changes a mind
Show on a big screenA tank overflows. One neighbour blames the motor, which pumps water up. Another blames the float, which should stop the water. Who is right?
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The idea
Each side is one explanation. Evidence is a fact that was checked.
Look at the evidence for each side. Hold the side the evidence backs best, for now.
Who said it does not count. What was checked does.
Each piece of evidence is written on a card. Count only what was checked. A guess is not a card.
Step 1 of 4
- Two explanations. No cards counted yet.
- Card 1 counted: motor 1, float 0.
- Eight cards counted: float is ahead, four to three.
- Nine cards counted: float leads, five to three. One card backs neither side.
New evidence can change which side leads. Then the idea you hold changes too.
Try the lab to finish this lesson.