Illustrated lessons: Age 13
125 illustrated lessons for Age 13, by subject.
Interactive lessons
Lessons with a machine to operate: turn the gears, run the engine, open the lock. Each one is open during its lesson’s week, then with a subscription.
Biology
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How snails make baby snails -
Heart, vessels and lungs at work -
Identical copies or varied young -
How We Breathe In -
Breathing In -
A Gene and a Mutation -
Bacteria That Survive -
Game Points and Dopamine -
DNA Code and Proteins -
Nerve cells passing a message -
One X or two X -
Whale Breath Hold -
Five Fingers in a Flipper -
Ice Edge Flower Pockets -
Inside the Heart and Its Vessels
Physics
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Small and large vibrating surfaces -
Why Space Is Silent -
Sunlight's 8-Minute Journey -
Series and parallel circuits -
White Light Through a Glass Prism -
Geostationary satellite -
Sail, keel, and forward motion -
Hot Rock Moves Earth's Plates -
Drone Camera Stays Level -
Hollow hull and solid marble -
Signals Under the Sea -
Spinning Cloud Becomes a Star -
Arms In, Spin Faster -
Light Bending at a Glass Surface -
Snow Layers and Cup Crystals -
Falling in Two Tubes -
Feather colors from grains and air pockets -
Series Circuit and Parallel Circuit