The First Book in the Learn with Alex and Anna series. One autumn morning, Alex watches as Grandpa plants baby trees in his parents' garden. He is surprised to learn that trees help the world. Alex then takes Freddie for a walk in the park with Auntie Lucy and Grandma. Whilst exploring a nature reserve in search of fairies Alex becomes a pretend tree. A park ranger joins them and Alex soon discovers how trees grow and how important they really are. Later, with a squirrel's help, Alex finds an acorn and returns home to plant it. The following spring, both Alex and his baby sister, Anna, find their brand new oak tree sprouting out of the ground, which makes a special visitor extremely happy. Read this story to find out how one tiny acorn can help the world.