4. Radium Clocks and Watches
Early 20th-century homes often featured clocks and watches with hands and numbers that glowed eerily in the dark. This effect was created using radium, a radioactive element unknowingly handled without caution. Users—and especially factory workers dubbed the ‘Radium Girls’—were exposed to dangerous levels of radiation, leading to devastating health consequences such as anemia, bone fractures, and cancer. Today, these luminous timepieces serve as a haunting symbol of the unseen dangers once lurking in everyday objects.
