close Inside the America 250 time capsule Engineers at the National Institute of Standards and Technology (NIST) build the America 250 time capsule, slated to open in 2276. Fox News' David Spunt reports for 'Special Report.' NEW You can now listen to Fox News articles! On Saturday, July 4, the United States of America celebrates our Semiquincentennial. We have been an independent republic for 250 years. That is a long time but not for certain countries. Egypt, India and Greece have existed for