US troops blew up enemy bridges with explosives in World War II to slow the advance of supplies or enemy forces. In modern times, patrollers use explosives at ski resorts to purposely create avalanches so the runs are safer when skiers arrive. Other than creating the desired effect (a destroyed bridge or avalanche), the users didn?t exactly know the microscopic details and extreme states of matter found within a detonating high explosive. In fact, most scientists don?t know what happens either.