We fit the logistic function, the reduced form of epidemic behaviour, to the data for deaths from Covid-19, for a wide variety of countries, with a view to estimating a causal model of the covid virus' progression. We then set out a structural model of the Covid virus behaviour based on...

Some pro-Brexit MPs will not vote for the government's proposed Withdrawal Agreement because of its fine print: they think it will be written in indelible tablets of law that we can never change. But they forget that sovereign states will not indefinitely stay in treaties that do not suit them,...