Illustrated lessons: Age 14
114 illustrated lessons for Age 14, 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.
Maths
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Measuring a tree with its shadow -
Parallel Bars Across Two Rods -
Thales's theorem in nested triangles -
Working out body mass index -
Thales and the nested triangles -
Parallel Lines Cutting Two Lines -
Scaling a Model -
Parallel Lines Across a Triangle -
Straight-Line Growth -
Ramp with Right Triangles -
Level Balance Pans
Physics
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How Water Mist Fights Fire -
Why a helicopter does not spin -
Thick air, hot planet -
Measuring the Sea's Depth with an Echo -
Same Mass, Different Weight -
Power in a circuit -
Interactive Water Falls, Power Flows -
Cue Ball Spin After Impact -
Earth as a Giant Magnet -
Tiny Center in a Vast Arena -
Tsunami from Deep to Shallow -
Arc of Colored Bands -
Two Skydivers, Two Top Speeds -
Field Lines Tilt at Every Latitude