some popular nonfiction picture books for children include:
"Oh, the Places You'll Go!" by Dr. Seuss
"The Very Hungry Caterpillar" by Eric Carle
"National Geographic Kids First Big Book of Why" by Amy Shields
"Big Machines" by Byron Barton
"The Magic School Bus: Inside the Human Body" by Joanna Cole
"The Boy Who Harnessed the Wind" by William Kamkwamba
"Who Was Martin Luther King Jr.?" by Bonnie Bader
"What Do You Do With an Idea?" by Kobi Yamada
"I am Malala" by Malala Yousafzai
"Ada Twist, Scientist" by Andrea Beaty
It's worth noting that this list is not definitive and might not be accurate since the data is not available and it's based on my general knowledge.