Are there 3 dimenionsional objects that exist for a moment and cease to exist everytime they change or are they 4 dimenionsional objects that persists because time exists? To better illustrate imagine a timeline, I today don`t know the answer and I later kow the answer. Opposed to the idea that I am 2 people because of these 2 events. I can here because I want science answer. What does science have to say?