When you push your finger into the bread you see how it drowns and makes a hole after a short while. Also when you push your finger into the cake, you find your finger making a hole. The same is with the sheet of paper. But on the other hand when you try to make a hole in at least one of 100-sheet stack you find yourself not making a hole in any of them. There are many other objects that take less or more pushing to make a hole. But when you push your finger into the wooden door you don't find your self making a single change, but since there are so many materials and many of them are "hole-making" and many or not, I think that after all it may definitely be possible to make such hole in anything out there, it just may take some time. SO here's my question, why is it happening? and is there any formula that lets me find a time needed to make a hole in any object after its chemical structure?