Hi all, this has been bugging me so maybe you can help me out. In the front window of my house, there is a dent in the glass that looks somewhat similar to this: http://www.flickr.com/photos/guerra/2557095422/" [Broken] However, there is not hole in the glass. But the shape of the dent is similar. The thing is, I am told that this dent was cause by a bb gun bullet that was shot FROM THE OUTSIDE, yet the dent looks like it was hit from the INSIDE (from a layman's intuition). This seems like it could have a physics explanation but I could be wrong. Can somebody explain why this happens? The dent from the inside looks like a crater, as in it starts out like a wide circle, and the center of this circle is it's deepest point. Hence why it is puzzzling that the bullet hit on the outside. By nature of my window I cannot examine it from the outside (it's on the second floor, etc.) but it almost appears as those the outside of the glass is not damaged, only the inside.