In baillargeon's view, infants have a pre-adapted, innate bias called the principle of that explains their assumption that objects do not change their properties unless some external factor obviously intervenes.

In Baillargeon's view, infants have a pre-adapted, innate bias called the principle of persistence that explains their assumption that objects do not change their properties unless some external factor obviously intervenes. Renée Baillargeon once represented totally new view towards the term of persistence which says that objects persist, just as they are, in time and space.

Both stories have something in common