NPD reports that this year’s print children’s nonfiction sales through the week ending July 24 are down just 5 percent—2 million units—from the historic high of 2020, and up 23 percent—6 million units—over 2019. The biggest BISAC categories this year are biography and autobiography, which grew 23 percent, and science and nature, which grew 9 percent, while activity books, study aids, games and activities, and concepts dropped. “While a number of juvenile non-fiction categories declined compared to 2020’s unprecedented spike in sales, the overall unit-sales volume for this supercategory remains very strong historically,” NPD book industry analyst Kristen McLean said. […]