Some readers may have noticed that, beginning on the first day of this month, each post on this page, as well as all the older posts, has two icons appended to the bottom right of the text.  The icons represent the options each reader now has for voting, thumbs up or thumbs down, on each post.  Readers are encouraged to use the voting icons, keeping in mind that their vote should be an expression of whether they felt the post was worth reading, i.e., was interesting, informative, or both.  If it was neither, a thumbs-down would be in order.  If the reader is ambivalent about the post, then no rating should be given.  Readers are also welcome and encouraged to rate previous posts, as far back as they wish to go.