The grey layer of zinc on the trough means it’s galvanized, so it resists rust. But it’s not rustproof. Acids in soil dissolve the zinc; then the steel rusts and leaks. So make sure to raise the ...

Is it something in the water, or have there been a lot of really cool servo projects lately? Mechaduino is a board that sits on a regular stepper motor and turns it into a servo with a closed loop ...