For a brief, shining period last summer, Pokémon Go reigned supreme. It brought obsession, joy, and, according to a new paper, injuries and death.

This working paper, appropriately and evocatively titled "Death by Pokemon Go," shows the darker side of the massively popular augmented reality game. Purdue University economists Mara Faccio and John McConnell combed through accident reports from Tippecanoe County, Indiana, in the first 148 days after the game was released in July 2016. In that county alone, the total value from injuries, damage, and the two lives lost is between $5.2 million and $25.5 million. If you scale this to cover the entire US, it would suggest that $2 billion to $7.3 billion were lost just in those few months.

The reports showed during those 148 days, 286 additional crashes occurred in the county, compared to the same period before. Of these, 134 were near pokéstops. In this scenario, it's crucial to determine that Pokémon Go caused these damages directly, as opposed to just causing people to be outside more, thus more likely to be hit by cars.