2 will hit shelves Sept. 13.
2 and EW has the exclusive first details, starting with the cover reveal above.
What is the first thing ever that you remember writing?

‘What If? 2,’ by Randall Munroe.Credit: Riverhead Books
A champion thoroughbred can run a mile a minute."
Which book is at the top of your current to-read list?
Where do you write?

Which book made you a forever reader?
I’ll always have a soft spot forA Wrinkle in Time, by Madeleine L’Engle.
If you could change one thing about any of your books, what would it be?
InThing Explainer, I explained how things worked using only the thousand most common English words.
Try describing how a sailing ship works without any of those words!
What is your favorite part ofWhat If?
I’ve gotten a few questions from little kids.
One of the most catastrophic scenarios in the book is a question from a kid about soup.
Write a movie poster tag line for the book:
I’m torn between “What If?
2: What if” and “What If?
2: What else.”
I think I’d just go with “What If?