Answers

  1. The Fourth Wise Man was a priest of the Magi named Artaban, a Mede from Persia who stopped on the way to Bethlehem to save the life of a child, and thus missed the caravan of the other 3 Magi.
  2. The super ego is responsible for morality, according to  Freud’s model of the psyche.
  3. The decibel was named in honour of Alexander Graham Bell.
  4. A Moebius Strip has only one surface and one side.
  5. In the Battle of Thermopylae, the Spartans were defeated by the Persian army under King Xerxes.  Although technically a defeat for the Greeks, it did mark the beginning of several important Greek victories over the Persians.

With thanks to Glenn Fawcett.