INSTANT NEW YORK TIMES BESTSELLER! Join the galactic conversation on the biggest issues in the universe, from the 'most popular scientist in the world'. ‘Don't fear change. Don't fear failure. The only thing to fear is loss of ambition. But if you've got plenty of that, then you have nothing to fear at all’ – Neil deGrasse Tyson Neil deGrasse Tyson is arguably the most influential, acclaimed scientist on the planet. As director of the Hayden Planetarium, and host of Cosmos and StarTalk, he has dedicated his life to exploring and explaining the mysteries of the universe. Every year, he receives thousands of letters – from students to prisoners, scientists to priests. Some seek advice, others yearn for inspiration; some are full of despair, others burst with wonder. But they are all searching for understanding, meaning and truth.