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If the balls were made of very smoothly polished metal would that be true?

It still wouldn’t be the suction of nothing. It would be the usual metallic bonds keeping them together.

It would still be true. This isn’t pressure welding copper, and if it was, the horses could pull that apart

> If the vacuum-"filled" ball were put into another vacuumed container, a small child would have no trouble separating the halves.

Hell, they would likely come apart on their own due to a low pressure differential and gravity pulling at them.

Not true!

Cold welding

At what point did anyone specify the surfaces are highly polished and clean?

Where can I see good explanations of these terms?

A small child in a vacuum chamber is going to have larger concerns.