Original sentence: He donated sperm to the Repository for Germinal Choice, a sperm bank founded by Robert Klark Graham in hopes of spreading humanity's best genes, and he proposed that individuals with IQs below 100 be paid to undergo voluntary sterilization.He postulated that the higher reproduction rates of those with lower intelligence, especially unskilled blacks, was having a dysgenic effect on society.He was harshly criticized by the media; however his involvement brought public recognition to several controversial topics and Shockley described his work on the issue as the most important of his career.William Shockley, who won the Nobel Prize in Physics for his work on the transistor, spent much of his later life focused on the questions of race, intelligence, and eugenics