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Wind Gyro, Gyroscopes & Tops: Educational Innovations, Inc.
Ellipse Spin Disk Science School Learning Game Toy Physics Stress
PhiTOP - Art of Play
The PhiTOP is an egg-shaped top (a prolate ellipsoid) that can be spun by hand to stand up on end. This is a fascinating demonstration used by Nikoli
Phi Top
Learn More — The PHITOP
Phitop Stress Relieving Ellipsoid Spinning Top Physics Marvel and
Learn More — The PHITOP
PhiTOP Magic Spinning Egg Stands Up On Its Own
Spinning Tops for Kids - Tippy Tops Flip Upside Down