The recent cyber attack that took down 1,200 websites was only a warning, says CHRISTOPHER MIMS, chief tech writer for the Wall Street Journal.  Experts say a similar, or larger, attack could be launched tomorrow, and we’d be "powerless to prevent it!"

No one seems to know who was behind the attack, but only that it was launched by a “botnet” of thousands of internet-connected devices. Find out which targets experts are worried about most and what lawmakers are trying to do about it!