Birth-Defect Cluster Illusion Simulator

Alleged "cancer clusters" or "birth-defect clusters" near power lines, factories or reported UFO-sighting hotspots are one of the most common environmental-health scares — and one of the most commonly statistically wrong. Because developmental anomalies occur at a known, non-zero baseline rate in every population, some towns will always show an above-average count purely from ordinary random variation, the same way some coin-flip runs land on more heads than others. This simulator generates many independent regions from a single shared baseline rate, highlights whichever region happens to look worst, and runs a real Poisson significance test comparing its observed count to the population baseline — then shows how a Bonferroni multiple-comparisons correction deflates the "signal" back to noise once you account for how many regions were scanned before picking the extreme one.