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Heat Sensitive Color Changing Patch: Temperature-Responsive Sheet for Scientific Experiments & DIY -
High-Speed Pull-String Zinc Alloy Spinning Top -
Key-shaped knife -
Magnetic Field Viewer Film & Flux Pattern Detector -
Mystic Rattleback: Asymmetric Physics Toy with Magical Reverse Spin -
Nitinol SMA Shape Memory Alloy Muscle Wire -
Transparent Lock
