Usually things that are used to make cars or things that fly. Sometimes things that are used to make power from wind. Any thing that is made up of many smaller things that must not be too big or too small, really.
Seeing how big things are using ways other than touching is being used more and more now. They use light to do it. It is much faster that way. But touching with a little stick is still the best way to tell how big something is.
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Seeing how big things are using ways other than touching is being used more and more now. They use light to do it. It is much faster that way. But touching with a little stick is still the best way to tell how big something is.