Greeting to everyone. This is my first time here (A bit nervous) According to many sources, many books, "Heisenberg uncertainty principle" tells us that it is impossible to measure anything exactly. I agree as the proving equation does not apply any measuring instrument at all which means that even the best measuring instrument will never gives us exactly measuring. Now comes to the problem. Does the HUP only applied when there is measuring ? I have two opinion about this: 1. We can not measure anything exactly which means nothing is certain at all. 2. Although we can not measure/predict anything exactly, everything is certain. Thank you very much.