In the fall of 2024, Citizen Math released updated versions of every lesson in our library, plus a few new ones! We know you may have already prepped an earlier version or planned a repeat of last year, so we're continuing to make these earlier versions available through Thursday December 5, 2024.

You can find the new lessons through the regular search, and we hope you love them as much as we do. You can read more about these updates in Our Community.

Click here for the updated version of this lesson!

How much should you trust your memory? According to neuroscientists, every time you remember something, you alter the memory a bit. The more you remember an event, the less accurate the memory becomes.

In this lesson, students use exponential decay to model memory fidelity and debate whether a bad memory is a good thing.

- Episodic memory does not work like a mental file cabinet from which we can retrieve perfect accounts of the past.
- Each time we remember an event we actually recreate and even alter it. Because the memory changes a little each time, the more times we remember an experience the less accurate it may become.

- Write exponential decay equations given a description of a relationship
- Graph exponential decay functions
- (Optional) Use logs to solve an equation with a variable exponent