Hand-Driven Newton's Color Disc Mechanics_Force & Motion Turning the hand crank walks

Turning the hand crank walks students through every stage of the 2-stroke gasoline firing cycle on a 14-inch model

Seventy-times enlarged skin cross section reveals epidermis

Acrylic bell-in-vacuum jar with an internal 4-6V DC electric bell that fades and falls silent as the enclosed air is removed

Aluminum-handled collecting net swings lightweight through tall grass and air sweeps for classroom field trips and introductory entomology sampling work

5 inches of nylon bristles for scrubbing glassware up to 4 inches in diameter

Hand-Driven Newton's Color Disc Mechanics_Force & Motion Turning the hand crank walksHand driven Newton's color disc that spins seven painted segments fast enough to merge into apparent white through persistence of vision and additive color mixing.