When it comes to electromagnetic waves, humans can really only directly perceive a very small part of the overall spectrum, ...

Learn how to tie the One-Eyed Knut friction hitch for smooth, reliable climbing control made for arborists and tree climbers.

Most solar lights are cheap garbage that exist just to put more microplastics into the environment as they degrade in short order. [Jeremy Cook] built his own solar light, however, and this one might ...