actually, island dwarfism has been known to scientists for a long time. elephants shrink, and rats grow large. anyways, it's one thing for island mice to become 3x their size. it's completely another thing for 6 foot tall bipedal humans to become 3x their original size.
In volume, it's believable, but not in height (3x, I mean).
If you want to believe the bible stories as metaphore, fine. Og was a 13 foot giant decendent of the Nephalim. If you take it as all true, then you shouldn't balk at a 13 foot man. After all, moses had just parted the red sea. And one of his desendents was about to go into battle where the earth stopped rotating, to give him more sunlilght to complete the job.
Steve, it didn't say he was 13 ft., it said his bed was.
Thanks, Classicist and Rex for the real-time demonstrations.What I'm saying is that "giant" is a relative word, though you may not accept that. Some people are generally smaller than others, this is genetic (possibly, though we don't know conclusively), dietary, and there are other factors. Now, it is possible that these Nephilim had average heights of 6-7 feet, while the others had an average of around 5 feet. Now, one tribe would definitely seem like giants to the other, especially in battle, which is where two different tribes usually meet.