Examination of posts by bloggers using the term revolution provides a reminder that there have been, throughout history, very many changes to which this label has been attached.

Going right back, you can start with the Neolithic revolution, occurring in different times in different parts of the world, which saw the human race of wanderers settle down to farming.

Moving into historical times, there have been many political revolutions; most historians would say that the French was the real biggie, but for truly modern history the Iranian Revolution stands out.

Moving right up to the present day, there's talk of a green energy revolution.

After you've seen all of that, do be careful about applying the term to, say, changes in the fashionable length of skirt…