How can use AddExplosionForce to explode scattered objects?

I have a central cube named "Explosion" sitting on a plane with 4 cubes placed around it. I apply the following script to Explosion:

var radius = 100.0;
var power = 1000.0;
function Start () {
    // Applies an explosion force to all nearby rigidbodies
    var explosionPos : Vector3 = transform.position;
    var colliders : Collider[] = Physics.OverlapSphere (explosionPos, radius);

    for (var hit : Collider in colliders) {

        if (!hit)
        if (hit.rigidbody)
            hit.rigidbody.AddExplosionForce(power, explosionPos, radius, 10.0);

When I run this, the four cubes barely move at all. I increase the power value, but it has no affect. When I put the cubes at the same location as the Explosion cube, they appropriately explode, but I want to be able to have them placed randomly.

Nevermind. I was editing default values in the script instead of the editor so I wasn't seeing any changes. Changes the editor variable values makes for some nice explosions.