Electrometallurgy, the science of producing metals from metallic ores through the use of electricity. It deals with both the use of electricity for various heating processes and the use of electricity to produce chemical changes (a process called electrolysis).
What if there are colors within the visible spectrum that our brains can't perceive? In fact, there are. They're called impossible colors. But some researchers think they've discovered a way to see the impossible.
They stick around long after death and compete with the likes of Dracula, Frankenstein's monster and the Wolfman as one of the great figures of classic horror movies. Are you brave enough to unravel the history of these real-life, tangible ghosts?