Term: Twin, Description: One of two offspring produced in the same pregnancy. Use with P31 on items for one twin, Question: Would Mark be Scott Kelly's slave in Yoruba society?, Answer:Yes
Fact1: Mark and Scott Kelly are twin astronauts. Fact2: Mark Kelly is six minutes older than Scott. Fact3: In Yoruba society, the elder twin is referred to as, "slave to the second twin". 