What's an example of a task that requires knowledge of physical objects to perform?
what to use to clean your tub

What's an example of a task that requires knowledge of physical objects to perform?
How can you make an old tire look like new?

What's an example of a task that requires knowledge of physical objects to perform?
How can I separate egg yolk from the white?

What's an example of a task that requires knowledge of physical objects to perform?
to sift flour without a sifter