Vikings are meant to ravage Europe, not to save it, but on September 14 Sweden's voters decisively rejected the option of signing up for the euro. The Swedes' rejection of that economic suicide note may have set in motion a process that could save the continent from the worst consequences of the EU's disastrous single currency. To start with, Sweden's nej was a valuable reminder to the electorates in the U.K. and Denmark (both of which have yet to accept the euro) that there is nothing inevitable about its introduction in their countries. It was also a signal to those Eastern European states that will join the EU next May that they too should think very carefully before adopting a currency that will almost certainly be unsuitable for their level of economic development for many years to come. Most important of all, if Brussels chooses to listen (early signs are not, needless to say, encouraging), the Swedish vote was a useful warning that the EU's current approach may lead to political and financial disaster.