Astro Teller, co-founder of Alphabet subsidiary “X,” is the grandson of Edward Teller, the famous physicist often considered the father of the hydrogen bomb. In this interview, Astro recalls how Edward loved to read him fairy tales and play bridge – though Edward played competitively with Astro’s other grandfather, Nobel Prize-winning economist Gerard Debreu. He discusses Edward’s love of answering big scientific questions, his family life, and time at Los Alamos. Astro explains that Edward missed working on science when he became more involved in politics and military matters later in life, and how Edward tried to warn the world about climate change decades ago. Astro also explores parallels between Edward’s work, the Manhattan Project, and his own work at X, and talks about the importance of applied research.