Key work on the traditional ballad was undertaken in the late 19th century in Denmark by Svend Grundtvig and for England and Scotland by the Harvard professor Francis James Child. They attempted to record and classify all the known ballads and variants in their chosen regions.
Gaslighting is a form of manipulation that seeks to sow seeds of doubt in a targeted individual or members of a group, hoping to make targets question their own memory, perception, and sanity. Using persistent denial, misdirection, contradiction, and lying, it attempts to destabilize the target and delegitimize the target's belief.
Gas Tungsten Arc Welding, commonly called TIG or Heliarc, is a welding process that uses a non-consumable tungsten electrode to heat the base metal and to create a molten weld puddle. An autogenous (no filler metal) weld can be created by melting two pieces of metal together.