Changing and challenges

Why do regime changes rarely work? What does the term ideological really mean and why is it so often used as an insult? An analysis of the coronavirus suggests it comes from bats who carry a host of viruses without themselves getting sick. How do they do it? How much BPA is too much and is there such a thing as too little to make a difference and why is there a stoush over this? How sick do we need to be before it's solved?