I totally wanted to keep the old thermostat for the neato mercury capsule, but on second thought, I didn't think it'd be such a good idea to have a highly toxic toy sitting around, especially with the curious little hands around.
Inside our thermostat (with the cover off)
During the unrelenting cold-for-no-reason here (no snow, just screamingly cold for days, and days, and days...), I suddenly remembered the old display greenhouses on campus