Learn how a spring stores and releases energy. Understand how work is done by spring force and how spring potential energy is ...

Experience the raw transformation of discarded metal into a finely crafted weapon as we forge a powerful bow from an old rusted leaf spring. This tutorial captures the process from start to ...

The tarot of the Bohemians : the most ancient book in the world : for the exclusive use of initiates by Papus, 1865-1916 ...