The solution for our December 14, 2015 challenge will appear after the holiday break in early January. So as to refresh your memory after a three-week hiatus, we will repost the challenge on January 4 and follow with the solution on January 5, 2016.

We will attempt to post regularly over the holiday break but posts may turn out to be intermittent.

If you come across an interesting story, study or research article in the meantime, please be sure to let us know!