David Pakman, author of The Echo Machine: How Right-Wing Extremism Created a Post-Truth America (Beacon Press) visited Brookline Booksmith, Brookline, Mass., to sign more than 2,000 store pre-orders--plus more for stock. Pictured: (from l.) Alex Schaffner, Brookline Booksmith community engagement coordinator, Pakman, and booksellers Jeremiah and Madeline.