Turtles All The Way Down (거북이는 언제나 거기에 있어) - John Green

Melissa Faulner, Rosanne Lauer, Steve Meltzer, and Natalie Vielkind.

I am profoundly indebted to Elyse Marshall, friend and publicist and confidante and fellow traveler,

and to many people at Penguin Random House who’ve helped to make my books and share them with readers.

I want to especially thank Jen Loja, Felicia Frazier, Jocelyn Schmidt, Adam Royce, Stephanie Sabol, Emily Romero,

Erin Berger, Helen Boomer, Leigh Butler, Kimberly Ryan, Deborah Kaplan, and Lindsey Andrews.

Thanks as well to Don Weisberg, and to the brilliant Rosianna Halse Rojas, whose insight and guidance informed every page of this book.

Ariel Bissett, Meredith Danko, Hayley Hoover, Zulaiha Razak, and Tara Covais Varsov read drafts of this manuscript with great care and thoughtfulness.

Joanna Cardenas provided invaluable insight and feedback.

And for all kinds of help, thanks to Ilene Cooper, Bill Ott, Amy Krouse Rosenthal, Rainbow Rowell, Stan Muller, and Marlene Reeder.

Jodi Reamer and Kassie Evashevski, agents extraordinaire, are the best advocates an author could hope for—and also the most patient.

Thanks to Phil Plait for astronomy help; E. K. Johnston for Star Wars expertise; Ed Yong for his book I Contain Multitudes;

David Adam for his book The Man Who Couldn’t Stop; Elaine Scarry for her book The Body in Pain;