Improvised explosive devices, or IEDs, kill more American soldiers in Iraq and Afghanistan than any other weapon. They can be terrifying for soldiers because the deadly bombs could be anywhere – in a donkey cart, a highway median, even in a dead body. The military spent $3.5 billion just last year trying to fight IEDs through better armor and better detection. Now it’s adding another approach: hands-on IED training exhibits. One of the first in the country opened at Fort Drum near Watertown Tuesday. David Sommerstein reports.