For 5 to 7 year olds who like engineering. Change
Ages 5–7
How tall can you build it before it falls over?
Can you keep the puppy in the shade?
Which objects will your magnet pick up?
Ages 7–12
The grown-up weighs three times as much. Where can the child sit to balance them?
Ages 7–13
The ground is about to shake. Build something that survives.
This lump of clay sinks. Make it float.