What's an example of a task that requires knowledge of physical objects to perform?
When making folds in leather, remember that

What's an example of a task that requires knowledge of physical objects to perform?
To remove rust from metal, you can

What's an example of a task that requires knowledge of physical objects to perform?
Remove a splinter from your finger.

What's an example of a task that requires knowledge of physical objects to perform?
How can men protect their faces from effects of sun's rays?