Barrel equalization with a siphon bridge and flood control continued rain barrels part 1 Lessons learned: This is a former rain barrel ...

a short photo essay A small footbridge I built 2005-07 across a "seasonal stream" at my last home. Tiny fish would swim up the s...

We hear so much about CO2 these days. I want to measure indoor or outdoor CO2 concentration at a reasonable cost (~$100). These are firs...