Everyone in the world has a birthday. But birthdays are not celebrated in the same way everywhere. Meet Mercedes in Peru, who eats a cake and a purple pudding called mazamorra morada. Ieva in Latvia is raised in the birthday chair, one lift for each year. And rather than celebrating his own birthday, Phuc Khang in Vietnam joins in the festivities during Tet, when everyone in the country turns one year older. Based on interviews with real people, award-winning author Margriet Ruurs tells the unique stories of how seventeen children from all around the globe celebrate a birthday, including how...

As young readers journey into the natural world, they will discover that numbers, patterns, shapes -- and much more -- can be found by observing everyday plants and animals. What if animals and plants knew math, just like us? Would flowers bloom in patterns? Would raindrops fall in rhythm? Would birds balance evenly on branches?

In Sorting through Spring, the second title in the Math in Nature series, nature comes to life to help children grasp concepts of patterning, sorting, data management, and probability. This interactive, poetic, and artful picture book series is a...

Nature comes to life in this picture book exploration of math concepts time and measurement featuring winter animals in cut paper collage. Full color.