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Special Report, News, Americas
A water mixture that's super chilled to well below freezing. Once the water freezes, at night when energy demand is low, it's ready to be used to cool the air the next day. This is called charging, and a charged off-peak cooling system takes very little energy to keep cold in stand-by mode until it's ready to be used to cool the air in an office building or home. As the building starts to warm up during the day, the air-conditioning kicks on, and the chilled refrigerant from the off-peak cooling system keeps the building's air cool. The glycol cycles through the ice filled tanks periodically to cool back down after being exposed to the hot air, and eventually, this exchange of hot for cold melts the ice. In the evening, the system charges again, freezing the melted ice with a chiller, and preparing the system for the next hot day. More complex systems can use other forms of refrigerant for cooling or use different design strategies for storing ice.|In May 2011, Americans were surprised by a sudden television appearance by President Barack Obama. He revealed that after a daring raid by U.S. Pakistan, al-Qaida leader Osama bin Laden was dead. While the Navy SEAL team that cornered and killed bin Laden became national heroes, another unheralded group played a crucial role in the successful mission. For months leading up to the raid, staffers from the National Security Council (NSC) had organized more than two dozen meetings involving multiple government agencies. In attendance were the NSC's principals, including National Security Adviser Tom Donilon, Joint Chiefs of Staff Chairman Admiral Mike Mullen, Defense Secretary Robert Gates and others. Obama went around the table, asking each adviser for an opinion on the raid, and weighed that information. When a president has to take action, it's crucial to have well-researched policy options on the table, and experts and advisers who can help him pick the best one. Once the decision has been made, it's vital to have someone coordinating the government's various departments and agencies to make sure they work together to achieve it.
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