Same headline. Two very different reactions. One retiree opens her statement, sees her bond fund in the red, and wonders if she should sell everything. Another retiree, same age, same savings, reads the same news and thinks: finally, my money can earn something again. Who's right? Both of them. And that's exactly why this week matters. On September 15, the 10-year Treasury yield climbed above 5%, reaching its highest level since 2007. One day later, the Federal Reserve raised interest rates...