2. If, for example, you observe any stone, or any other regular or irregular lump, it will soon become apparent that it's center of gravity is not equally evident on all parts of it; In particular, you can see this most easily with a somewhat misshapen wooden peg by placing it on water, where it will always sink it's center of gravity deepest into the water. This would be the second point, which everyone can easily find with every object.
3. The third point of a body is it's real center - which, however, is never to be confused with the center of gravity of a body; and therefore every body has two centers, namely one of gravity and one of it's physical measure. You may also examine bodies of whatever kind, and you will never find that the center of gravity and the center of the body measure coincide completely in one; not even with a perfectly mathematically correct cast metal sphere, and that because absolutely nobody consists of such perfectly equal parts, according to which the center of gravity could coincide with the actual center of the body measure in completely one.