I saw CSI today and a glass was broken on the crime scene and furensics took one sample fracture from there and did one experiment in the laboratory also. (experimentor broke a window (glass) with baseball bat). And then they analysed those 2 fractures(one from scene and one from lab) and determined that the glass broken on the crime scene was done from the inside not from outside which would refer to burglary. But i couldnt figure out how. They talked about some Haeckel marks??? and i typed it into google search and found nothing. Anyway can someone tell me the method determing whether normal window (glass) is broken from inside or outside, or is my question too confusing?