A newly declassified set of UFO-related FBI and Pentagon documents has reignited global fascination with unidentified aerial phenomena. Among the most startling claims are witness accounts describing possible “four-foot-tall” humanoid beings seen in connection with unidentified flying craft.

Add Yahoo as a preferred source to see more of our stories on Google. Adapt or die: How do you grow and evolve to fit into an alien environment? How do you create change in the face of overwhelming power? And how do you tell your extraterrestrial overlords ...