PHILADELPHIA -- There is an unique and historic way America's 250th birthday will be marked in Philadelphia. "America's Time Capsule" will be buried on July 4 at Independence National Historical Park near Independence Hall and the Liberty Bell. It will remain sealed for 250 years, until 2276. The America250 Commission, who is behind the project, describes it as a bell jar designed to create an air pocket and help prevent water intrusion underground. It is expected to include items from all 50 states, Washington, D.C., and five U.S. territories, as well as contributions from Congress, the Supreme Court and the...