With around 50 heads of state in Washington this week for the U.S.-Africa Leaders' Summit, the streets are ablaze with the police sirens intended to keep them safe and moving freely about the city. However, will the current focus on the continent be a fleeting occurence?With around 50 heads of state invading Washington this week for the U.S.-Africa Leaders' Summit, the streets are ablaze with the police sirens intended to keep them safe and moving freely about the city. Federal employees were encouraged to telecommute, which should be particularly true for USDA since it is adjacent to the Mandarin Oriental where many events are centered.Speaking of events, the think tanks and other organizations that dot the capital's landscape have also ma...