Jim Tucker, who has been investigating the Bilderberg Group for decades, remembers a time when the existence of the group itself was denied.

The 2012 USA Science & Engineering Festival held its Grand Finale Expo at the at the Walter E. Washington Convention Center in Washington, D.C., on April 28-29.

NASA’s Mars rover entertains kids at the 2012 USA Science & Engineering Festival on April 28 at the Walter E. Washington Convention Center in Washington, D.C.

NASA’s ‘Moon Quest’ simulator educates & entertains kids at the 2012 USA Science & Engineering Festival on April 28 at the Walter E. Washington Convention Center in Washington, D.C.

A tornado generator by Weather Underground educates & entertains kids at the 2012 USA Science & Engineering Festival on April 28 at the Walter E. Washington Convention Center in Washington, D.C

Lockheed Martin demos a ‘gaming with purpose’ with a simulation suit at the 2012 USA Science & Engineering Festival on April 28 at the Walter E. Washington Convention Center in Washington, D.C.

US Secretary of Education, Arne Duncan, test drives the Mondo Spider robot at the 2012 USA Science & Engineering Festival.

Aldebaran Robatics’ NAO, a fully programmable, interactive humanoid robot gives a demo at the 2012 USA Science & Engineering Festival on April 28 in Washington, D.C.

The USA Science & Engineering Festival is the country’s largest organized celebration of science and engineering.

Hundreds of thousands of people of all ages cheered at the National Independence Day Parade, composed of thousands of performers who marched and danced along Constitution Ave from 7th Street to 17th Street, passing through just a couple of blocks from the White House.