What an incredibly sad day that brings so many memories rushing back. It sucks to live in a world where immediately when hearing about this, I knew exactly what it was. Straight out of the terrorist handbook. Major event, lots of people, high profile, incite panic, etc. Its hard to find the positive in these events, but this could have been a whole lot worse had these devices been packed in cars or trucks. They would have leveled blocks. I'm so sad for these victims, but proud of the response of so many people. Many times these secondary devices are designed to kill emergency responders or those running from the first detonation. But people ran headlong into danger to help each other as we always seem to do in these horrible times. My heart is with those in Boston, a tremendous city with tough, gritty people. We will get through this.