1870s poltergeist story
Its quietest recent week still sits 173% above the old baseline. A news spike leaves the floor where it was.
Share of the last four months of extra attention that landed in its busiest seven days. High means a single story, not a trend.
How much of this topic's shape repeats every year. The annual cycle is estimated per topic and divided out before anything is measured.
Bot and scraper traffic is flat across the week. Anything with implausibly low day-to-day variation, or with no weekday/weekend pattern at all, is dropped before it reaches this page.
Long enough to separate this year's move from last year's level.
No second source yet. Common for consumer and culture topics, which do not show up in developer data.
The Great Amherst Mystery was a notorious case of reported poltergeist activity in Amherst, Nova Scotia, Canada between 1878 and 1879. It was the subject of an investigation by Walter Hubbell, an actor with an interest in psychic phenomena, who kept what he claimed was a diary of events in the house, later expanded into a popular book. The case was dismissed as a hoax by skeptical investigators.