Various

Teenager Builds a Nuclear Reactor in His Backyard, Exposing Thousands to Radiation

Five houses away

The reactor worked so well that David was able to measure the radioactive radiation from his nuclear reactor up to five houses away. That was not quite what he intended. He put the health of his neighbors at risk. David may have been very indifferent with respect to his own health, but the health of other people was very important to him.