Of technical interest– I discovered a data artifact that was causing some false elevation in past graphs. Often the graph showed a substantial spike during periods when I was standing at the kitchen counter, typing on my (half-frozen) laptop, about four feet away from the datalogger (you can see one of these blips the graph above, at 8pm). For a while I attributed this to body heat affecting the device, and tried moving further and further away– but the effect persisted. Finally last night, with some experimentation, I found that it was the datalogger itself producing the heat– when connected via its cord to the laptop USB, it seems to warm itself by 2-3º until unplugged. Doh! (It isn’t charging at these times– it has a standard battery– it must just be… thinking hard…) So, no more leaving the datalogger plugged in while I’m puttering.