Via Washington Post: Intelligence analysts believe that Iran is encountering technical difficulties in mastering the complex process of uranium enrichment. The centrifuges are overheating. Some are breaking down and must be replaced. As a result, Iran has not ramped up its enrichment effort as quickly as analysts had expected. Analysts agreed that if Iranian scientists continue with enrichment, they are likely to solve the technical problems eventually. That’s why U.S. and European officials are still calling for Iran to suspend enrichment, before they have cracked the puzzles they are encountering.