active gemlogs on a few select subjects?

Hi, does anybody have links to share for active gemfeeds that cover any
of the following subjects:

- analog electronics, like board level electronics involving things like
  simple analog components (resistors, capacitors, etc.), op-amps,
  analog signal processing.

- analog computing. probably my gemlog is the only one, but I thought
  I'd ask...

- creation (nature) photography

- botany, like people who study local flora

- astronomy, amateur astronomy

- Any Hebrew language gemlogs out there?

--
Christopher Howard