TIL Thomas Edison unintentionally caused the death of his assistant, Clarence Madison Dally, through radiation poisoning which caused cancer. Edison realized his X-ray experiments had poisoned Dally and stopped his research on X-rays after Dally’s death.

TIL Thomas Edison unintentionally caused the death of his assistant, Clarence Madison Dally, through radiation poisoning which caused cancer. Edison realized his X-ray experiments had poisoned Dally and stopped his research on X-rays after Dally’s death.