This article considers the accuracy of the official national population projections made for the UK over the last fifty years The findings take account of the revision to population estimates following the 2001 Census and are largely similar to the findings of a previous review carried out after the 1991 Census. The total population has been projected reasonably accurately but this is largely a...

Most of the current successful systems for automatic speech recognition are based on hidden Markov models (HMMs). HMMs are basically general-purpose statistical pattern matchers, but have so far proved more successful than approaches which have been based on specific knowledge about speech. This paper discusses the likely reasons for this success. It is argued that, in addition to providing a t...

Citation: Danan A, Farfurnik D, Bar-Ad S and Vaidman L (2015) Response: Commentary: " Asking photons where they have been "-without telling them what to say. A commentary on Commentary: " Asking photons where they have been "-without telling them what to say In a recent Commentary, Salih [1] claims that we " devised an elegant experiment investigating the past of photons inside two Mach-Zehnder...

In a recent letter, Danan et al. [1] devised an elegant experiment investigating the past of photons inside two Mach-Zehnder interferometers, one inside the other—yet drew the wrong conclusions. Namely, that—based on weak measurements on preand post-selected states—some photons have been inside the inner interferometer but they never entered and never left. And, consequently, a “common sense” a...