Engineering in Legend of Korra

From what did Varrick harvest the spirit energy from?

Who developed the Spirit Energy technology?

Varrick mentions that Spirit Energy is a pure energy that is unstable in Earth conditions. This is because Spiritual Energy from the Spirit World originates from a place where all things begin, a location of pure energy that simply "IS". Based on our understanding of new vocabulary words and energy, why do you think the spirit energy can be transferred by electrical currents?

How did Kuvira harvest the spirit vines from the base of the Swamp's Grove Tree?

Which kind of area is characterized by common bloodlines, close bonds in a town/area and communal behavior. It’s more like a small town where everyone knows everyone. People from this kind of area are all most likely to be from the same country/culture.

Which kind of area is characterized by distant bloodlines (which means, a bunch of different ethnicities and cultures. People are from all over, diverse)

Which word means "a new method, idea or process of doing things " ?

What is a short burst of electromagnetic energy

What kind of culture would you describe Republic City to be?