How America lost its only native parrot. Trace the Carolina Parakeet's rapid decline, the causes of its disappearance, and the official 1918 extinction date.
Heat your pond for free. Discover how to leverage solar energy, earth insulation, and windbreaks to maintain optimal, stable water temperatures year-round.
Why is your PD a fractional number? We explain the necessity of half-millimeter precision for accurate lens centering and how to handle asymmetrical measurements.