"STEM fun for smart tots! Meet Mia, Ava, Oli, and Seb: they're the four engaging characters created by Harriet Blackford to introduce very young children to STEM concepts. This simple story, enhanced by Mike Henson's humorous illustrations and fun-to-do experiments, makes a fascinating subject come alive for preschoolers. Why is it light during the day and dark at night? Kids can find out, and learn all about how our Earth revolves round the sun."--Provided by publisher.