Nizar Ibrahim scours Northern Africa for clues to what things were like there in the Cretaceous period. A 2015 TED Fellow, he has spearheaded the recent search for the semi-aquatic dinosaur Spinosaurus.
Nobel laureate James Watson took part in one of the most important scientific breakthroughs of the 20th century: the discovery of the structure of DNA. More than 50 years later, he continues to investigate biology's deepest secrets.
Rajesh Rao seeks to understand the human brain through computational modeling, on two fronts: developing computer models of our minds, and using tech to decipher the 4,000-year-old lost script of the Indus Valley civilization.
Yuval Noah Harari is a historian, philosopher and the bestselling author of "Sapiens," "Homo Deus," "21 Lessons for the 21st Century" and the graphic novel series "Sapiens: A Graphic History." He is considered one of the world's most influential public intellectuals today.