1. The US Army design guide is
available for download (top, right).
Via.
2. "On Feb. 5, 1958, a B-47 bomber dropped a 7,000-pound nuclear bomb into the waters off Tybee Island, [Georgia], after it collided with another Air Force jet. Fifty years later, the bomb — which has unknown quantities of radioactive material — has
never been found." Via
these sites.
3.
Custom Portal gun.