•Hub attacks, as shown by Duncan Calloway of Cornell, with Mark Newman, Strogatz, and Watts, can kill a scale-free network in no time. However, it requires simultaneous removal (so that links do not have time to reattach elsewhere). The problem then becomes cascading failure.
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•Cascades are not instant, Duncan Watts showed. There is a tipping point there as well. The initial failure may result in a catastrophe many times its size, a very long time later.