Date of this Version
In this 25-minute film, students attempt to solve The Algae Puzzle, The Frog Puzzle, and The Mealworm Puzzle, and explain and discuss their logic.
A highly illuminating look at students’ reasoning processes.
The "document" here is a PDF file showing 9 still-frames, the actual video is attached below (in 2 versions) as "Related Files":
An MPEG-4 movie version (for Quicktime or other player), at 263 Mb.
A Shockwave Flash version, at 227 Mb.