Look! Up in the sky! Randall Munroe at xkcd created a handy chart so that all those people on the ground trying to identify a flying object can tell whether it is actually a bird, or a plane, or Supermen.
Look! Up in the sky! Randall Munroe at xkcd created a handy chart so that all those people on the ground trying to identify a flying object can tell whether it is actually a bird, or a plane, or Supermen.