What meakes a human develop into a right handed OR left handed person?

The have found 2 main things influcence whether you are right or left handed, one is a gene which controls which hemisphere controls certain functions. The other is environmental high levels of testosterone on a developing foetus can cause left handedness because testosterone stunts the growth of the left brain hemisphere causing the right hemisphere to take up the slack, therefore left handed. It is not 'passed down' in most cases.Im a lefty and none of my family is, not even distant relatives.

It's a crazy thing. My hubs explain it much better, this is something i've always been interested in. hubpages.com/hub/Left-Handed---Why-I-Bre....

By Lefthanded Writer published 22 months ago.

Its genetic... But I made an old custom infuencing.... answer here: hubpages.com/t/9a025.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.