Zipporah is mentioned by name only 3 times in the Bible; Exodus 2:21, 4:25 & 18:2. Her father Jethro is only mentioned by name 10 times between Exodus 3:1 & 18:12. The Ethiopion woman is mentioned after the last mention of both Zipporah and Jethro,and this is historically later as well,isn't it? Where is the Biblical proof that Moses didn't remarry? I am not pushing this notion as fact, but it's a reasonable question.