Meet the mustachioed, Danish father of room temperature.

This smilling, Danish scholar is professor Ole Fanger, whose 1970 book "Thermal Comfort" is the rock on which the whole edifice of modern HVAC is built:

Over on the coworkout blog, you can read more about:

• The "Predicted Percentage of People Dissatisfied" (PPD) index,
• The fct ratio, which takes into account the percentage of skin covered by clothing
• The Sandex, which is an index that Randy and I are working on to measure the relative awesomeness of your local weather when compared to the weather in San Diego, CA.
• The Sandex, automatically calculated from NOAA forecasts, will be used to answer the question: "Should we work outside tomorrow?"

Anyhow, if you're interested in working outside this spring and summer -- Fridays, generally, or whenever the Sandex tops 90%, then check out the coworkout blog, and follow @coworkout on Twitter!