Over 60 years ago, a family in Mexico began to fall mysteriously ill. Fevers, fatigue, and strange symptoms swept through the household, but no one could explain why. The cause wasn’t in the water, nor in the food. It was a small metal capsule containing cobalt-60, a radioactive material, that had been sitting quietly in their new home, unleashing an invisible catastrophe. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

The story begins in March 1962 when the family moved into a new house in Mexico City, where a small lead container was found, according to a report by the family's doctors.

At some point between moving in and April, the radioactive source was taken out of the lead container and ended up in the yard. It was then found

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