In 1879, electricity had been used in arc light for outdoor lighting. The famous creator of electricity was Benjamin Franklin. Electricity lights up the world. It also helps advance many things that work better when they are being ran by electricity.
Perhaps what Nikola Tesla calls "the core" is what Nassim Haramein and others call the vacuum or SPACE itself, otherwise known over time as: aether, plenum, zero point field, source field, quantum foam, creator, god or whatever you want to call the very fabric of the universe... We need to learn how to tune our receivers (hearts and minds) to the fundamental frequencies of the universe and learn.. --Nassim Haramein