The document is meant to act as a resource for elementary through middle school teachers, featuring 6 science activities connected to Indiana state standards with grade-appropriate science connections aimed toward 5th, 6th, 7th, and 8th grade.
The Curie point of a metal is the temperature at which it loses its magnetic characteristics. Heat can cause magnets to stop being magnetic, which is why heating up magnets is not advised. The engine works because the Curie point of nickel is 354 degrees Celsius, a temperature that can be reached with a simple candle flame. Below are instructions about how to build your own engine and how to extend this activity for an entire classroom to experiment and build.
Stan, Patricia L. and Knight, Emily, "Educational Resources: Curie Point Engine" (2018). Collaborative Scholarship: Chemistry. 5.