I've read at least a dozen accounts of this happening (even once, a Grizzly bear).
Do you think this is even possible, and if so, how? I mean when you look at humans we are weak. We don't have claws, or fur, or scales. We have to use our brain to use what is around us to forge weapons and armor, so I'm wondering how a bare-handed human could defeat a bear in a melee. Is the human brain really this powerful, or are these stories all bogus?