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.
TIG, Heliarc or GTAW (Gas Tungsten Arc Welding) is a welding process where a non-consumable tungsten electrode is used to heat up the material and melt it, creating a weld puddle. Unlike GMAW, the weld is produced from a single metal type, because there is no filler metal used for the weld.