Sure thing . I ' ll beat Portal 1 first and when im done with it i ' ll tell you ! .<| sep |> A definition not free of ambiguity does not imply invalidity . Would you say that because you can ' t give a definition of blue down to the exact boundaries in nanometers of the frequency of light then therefore blue is not meaningful ? Even if you could do this , your exact rigorous definition would be controversial and someone would come along and argue it should be 0 . 1 nm instead and therefore your definition is false . This wouldn ' t make blue an invalid category . <| sep |> If the Lions go to the Super Bowl , I hope they do some kind of promotional video which just follows Caldwell around in his daily life , nonreacting to increasingly crazy situations