Just the toss of a coin ...

Random silencing of genes may explain family differences: study --A process which leads to some human genes being randomly "silenced" is more common than thought and could explain why siblings react differently to illnesses ...

"It adds another layer of diversity beyond genetic diversity," explained Andrew Chess, an associate professor of medicine, and a molecular biologist at Harvard Medical School in Boston, Massachusetts.

He noted that with random inactivation, even identical twins are not identical.

I do not mean to sound sarcastic here, but who thought identical twins really were completely identical? Our unaided senses do provide much useful information, you know.

I luv science but I remember when scientists were telling us that dogs don't think and all canine actions were preprogramed. Well I had eyes and a brain and science has caught up with them. But I do wish that scientists would write their own 'copy.' Most journalists do not do science justice. Most journalists don't do journalism justice either, come to think of it.