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Stirling Free Power is presented as a DIY alternative-energy project designed for people interested in generating useful electricity from heat. The concept is based on the Stirling engine, a real heat-engine technology that can convert a temperature difference into mechanical motion and, when...

Boar Green Boresight is a green-laser firearm sighting accessory marketed as a tool for helping users align an optic with a firearm's bore before live-fire confirmation. The product is designed around a visible green laser and is promoted for use with different firearm platforms and calibers...