I don't believe a lot of the fear-mongering I read about genetic modification. So it's good to learn that scientists have found a new way to keep their creations safely contained in the lab.
The US researchers engineered bacteria that can only feed on an artificially created nutrient that doesn't exist in nature. So in the unlikely event some bugs escaped, on someone's shoe say, they would be unable to spread.
It's comforting to know we're safe, and I hope this puts people's minds more at ease about GM.