Months ago, I submitted a Challenge Question that never got used, so I have decided to make use of it here. This question is not like most of the CQ's. It's not so much a how or why question, but a what and who question. It does have a scientific angle, of course, or I wouldn't bother posting it. Here goes:
You enter a diner in the central US plains in the springtime, and notice 2 young men looking at a chart on a laptop computer. One says,"Look at that CAPE!" The other says,"That's a loaded gun, alright!" Of course, you ask them what they are talking about. They respond with a scientific explanation of...what?
And what are these guys? What kind of chart are they looking at?
I'll post the answer in a week or so, unless someone comes up with the answer, or everyone gives up and begs for the answer.
This one will require some investigation and research, which is an often overlooked part of engineering. Have fun!
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