A world of
little wonders
Unroll a circle. Follow a wave. Build a bridge.
Big ideas start with a little play.
See why it works. Then try it.
0 of 2,201 discoveries collected
Explore 1,100 big ideas through moving pictures. Change a setting, follow the steps, and make a discovery.
1,100 adventures to explore
Unroll a Circle
How can curved rings become almost-straight strips?
Two Triangles Make a Parallelogram
Why is a triangle half of base times height?
Slide a Slant into Place
Can a slanted shape keep its area when a corner moves?
Pair Two Trapezoids
Why do both parallel sides get averaged?
Squares on a Right Triangle
How can two square areas exactly fill a third?
Flatten Three Corners
What happens when a triangle's corners meet on a line?
Walk Around a Polygon
How much do you turn during one complete walk?
Roll a Circle Flat
How long is one trip around a circle?
Two Radii Across
How many radii stretch all the way across the center?
Grow Every Direction
Why does a twice-as-wide shape cover four times the area?
Same Fence, Different Garden
Can one fence length enclose different amounts of ground?
Rows Build a Rectangle
Why does width times height count every square once?
A note for grown-ups. Start with Starter adventures, then follow your child’s curiosity. Learning sets offer ten related experiments and puzzles around one idea. Each adventure includes something to try together away from the screen. Discoveries stay in this browser.