In 1974, Maharishi Mahesh Yogi made a prediction: if one percent of a population practiced Transcendental Meditation, the quality of life for the whole community would measurably improve. This became known as the Maharishi Effect.
The first published test came in 1976, when researchers examined crime statistics in cities where TM practitioners made up more than one percent of the population. The results showed a statistically significant reduction in crime rates compared to matched control cities, published in the Journal of Crime and Justice.
In 1993, researchers brought 4,000 advanced TM practitioners to Washington D.C. during the summer β statistically the most violent time of year in that city. The prediction, filed in advance with city officials and an independent review board, was a 20% reduction in violent crime. The actual reduction was 23.3%.
The effect has been replicated across multiple continents, multiple cities, and multiple types of collective stress metrics including crime, accident rates, hospitalization, and armed conflict. Studies have been published in Social Indicators Research and the Journal of Conflict Resolution.