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6 subjects. 147 things to find out, make and try. Everything works without signing in.
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- A Bone Is Two Materials at OnceMake
Soak a clean chicken bone in vinegar for a week and you can tie it in a knot. Nothing was added. One of its two ingredients was taken away.
- A Cave Is Dissolved, Not DugTry
Nothing pushed the rock aside to make a cave. The rock left as a liquid, one speck at a time, through the same crack the water came in by.
- A Coastline Has No LengthTry
Two countries measured the same border and got answers 227 kilometres apart. Neither had made a mistake. They had used different measuring sticks.
- A Contour Line Is a WaterlineTry
Those thin brown loops on a walking map are not decoration. Each one is the edge a flood would make if the water stopped at exactly that height.
- A Desert Is Not Made By HeatTry
The rule for a desert is a rainfall figure, and temperature is not in it. Which is why the largest desert on Earth is Antarctica.
- A Dry Summer Shows Buildings Nobody Has SeenTry
In a drought, wheat growing over a buried ditch stays tall while the rest goes short. From the air the crop draws a plan of what is underneath.