Good article, and interesting comments after the first few lines of bickering.

Scientists in the United States have managed to turn human embryonic stem cells into a type of brain cell linked to memory loss in Alzheimer's disease. The research, published in the journal Stem Cells, should help in the development and testing of potential new medicines to treat the neurodegenerative disease which affects around half a million people in the UK.

Fergus Walsh is the only journalist I could find to write carefully on this.
I heartily agree with the following paragraph.

I confess I worry about the phrases "major breakthrough" and "major step forward". For me, the former should be reserved for something which is a game-changing piece of research, or a new device or treatment which transforms the way we combat a condition. Like many things it's hard to describe, but you know it when you see it. "Major step forward" is problematic unless you also know how many steps there are left to travel on a journey.

Proceed to the article at BBC News.