The one that [Made in Poland] chose to sacrifice was particularly nasty and greasy, but after popping off the pulley, the treasure within was revealed: the large, ring-shaped clutch electromagnet.

A coil with an iron core is called an electromagnet. The iron core increases the coil’s magnetic field strength. A simple electromagnet is made by coiling wire around an iron nail. An iron core ...

The team used "simple technologies" like low-tunnels, a thermal insulated material hung over a crop using wire hooping. "What this does is it raises the soil temperature and it raises the air ...