Short answers, pulled from the story.
The Hammersmith Ghost hoax of 1804 was a terror campaign in London where a cobbler named William Bunce dressed as a white specter to scare his apprentice. This event, documented in Roger Kirby's Wonderful and Scientific Museum, is considered the first recorded instance of a modern ghost story. The panic was so severe that local authorities intervened to stop the disturbance.
The English word ghost originates from the Old English gāst, meaning breath, spirit, or soul, with roots in the Proto-Germanic *gaistaz. The term evolved from a synonym for the breath of God to a specific designation for the soul of a deceased person appearing in visible form during the 14th century. This linguistic shift reflects a cultural change where the soul became a distinct entity capable of interacting with the living.
Ancient Greek ghosts became frightening creatures by the 5th century BC that hovered near corpses, leading to annual feasts to honor them. Roman beliefs included the story of Pliny the Younger where a house in Athens was haunted by the ghost of a murdered man until a skeleton was properly reburied. These accounts established the haunted house trope where physical remains of the dead are key to supernatural presence.
The Spiritualism movement reached its peak growth in membership from the 1840s to the 1920s with over eight million followers in the United States and Europe. This monotheistic belief system posited that spirits of the dead could be contacted by mediums and supported social causes like the abolition of slavery. Credibility weakened by the late 1880s due to fraud accusations among mediums.
In India, the churel is a mythical spirit of a woman who died during pregnancy or childbirth who can shape-shift to lure men. The most feared spirit in Thailand is the Phi Tai Hong, the ghost of a person who has died suddenly of a violent death. These beliefs are deeply ingrained in the subcontinent with many allegedly haunted places such as cremation grounds and dilapidated buildings.
Modern research links ghost sightings to environmental factors such as infrasound, magnetic field variations, and carbon monoxide poisoning. Researchers have found that ghost sightings may be related to degenerative brain diseases such as Alzheimer's disease and certain prescription medications. The concept of pareidolia describes the innate tendency to recognize patterns in random perceptions which causes people to believe they have seen ghosts.