For my son, the issue comes from having too much knowledge. He understands the risks involved in things like swimming. You can breathe underwater, if you fall you will drown etc. He is like that about everything. He watched other kids go down the slide on the playground for two days before he would try it, weighing the risks. I have talked to him about fear keeping him from amazing opportunities and was informed that he is "not scared, just cautious". He goes through a whole process of observation before trying anything new. ND kids don't stop to consider what might happen, ours do.
