The other side of the coin, technology can be used to prevent that from happening in the first place, if people -- if people are focused on it. >> reporter: one georgetown professor said thursday's meltdown was just a preview and that the system is dangerously unprotected. >> where does human judgment come in? well, where i think it needs to come this is what we need to have is an awt mated system in place that when markets get chaotic, we immediately have an instantaneous trading halt in computer time, not human time, then human judgment comes in. the humans can examine the situation, and whe...