- Cooking.
- Moving things.
- Folding things.
- Heating things.
- Cooling things.
- Keeping smoke out.
- Keeping rain out.
- Making chairs smaller.
- Making wheelbarrows fold.
- Stopping fat falling into a fire.
Some of the drawings are more than 100 years old. And the surprising thing isn’t how old the ideas look.
It’s how familiar the problems are.