I’ve written before about my belief in giants, the Nephilim, satyrs, centaurs, etc, etc. I think there is strong Biblical inference that genetic manipulation was being practiced by spiritual beings from Genesis 6 until the flood. Consider the multiple dimensions postulated in string theory and by Christian scientists. How easy for a spiritual dimension to exist alongside ours, and for cross-overs to occur! And then in examining the story surrounding the tower of Babel and the description of Nimrod, there may have been more genetic manipulation being done by man (assisted by beings from other dimensions sharing knowledge with men).
Anyway, historical finds indicate giants were not all that uncommon in recent history. Consider these weapons finds.