There really isn't any scientific backing for this; it's just what the statistics show. People of African American descent are very much more likely to develop certain types of cancer. Biology and genetics are believed to be a part of this tragic problem, but there's no explanation to support any of it.
For the first time, genes chemically silenced by stress during life have been shown to remain silenced in eggs and sperm, allowing the effect to be passed down to the next generation.
