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Loren (Coolhobiecat) has two excellent threads on our sister site.
The first is dedicated to the macroscopic extreme of the universe: Astronomy. As a practicing astronomer, Loren brings a great deal of expertise to the effort, and has attracted at least one excellent amateur astronomer, Isabelle. It's a great thread, check it out if you haven't already. The Topic is Astronomy
The second thread is dedicated to the other end of the scale: The Microscopic World. Loren has been searching through a bottle of stagmant water from a nearby pond with his telecsope turned around backwards (OK, that's just poetic license, he really does have a microcscope). Check out the minature world which exists unseen and unappreciated all around us. Microscopic Stuff