As spring slowly turns to summer, a little boy builds a fort and plants a garden in impatient anticipation.

In this charming book, one little boy can’t wait for summer to arrive. He keeps asking, “Mama, is it summer yet?” Mama responds saying, ”Not yet,” but there are plenty of signs that indicate spring is changing into summer: The earth is soft and there are seeds to plant, birds singing, ducklings in the pond, and pink blossoms blooming. The young boy even wears his bathing suit and carries a beach pail in preparation, but will it ever be summer? The text is a wonderful celebration of the change of seasons and showcases Nikki’s images of nature and the joys of family and community.

Rhyming text and illustrations explore the ways people, animals, and even objects can form families.

Reading Wonders Literature Big Book: Ana Goes to Washington D.C. Grade K is one title in the collection of beloved trade books in Big Book format for whole-class instruction and shared reading. 22 books at Grade K (two per unit).

A mother reassures her child about the wind, lightning, and thunder when a storm passes through.

This book is dedicated to Aristid Lindenmayer on the occasion of his 60th birthday on November 17, 1985. Contributions range from mathematics and theoretical computer science to biology. Aristid Lindenmayer introduced language-theoretic models for developmental biology in 1968. Since then the models have been cus tomarily referred to as L systems. Lindenmayer's invention turned out to be one of the most beautiful examples of interdisciplinary science: work in one area (developmental biology) induces most fruitful ideas in other areas (theory of formal languages and automata, and formal power series). As evident from the articles and references in this book, the in terest in L systems is continuously growing. For newcomers the first contact with L systems usually happens via the most basic class of L systems, namely, DOL systems. Here "0" stands for zero context between developing cells. It has been a major typographical problem that printers are unable to distinguish between 0 (zero) and 0 (oh). Thus, DOL was almost always printed with "oh" rather than "zero", and also pronounced that way. However, this misunderstanding turned out to be very fortunate. The wrong spelling "DOL" of "DOL" could be read in the suggestive way: DO L Indeed, hundreds of researchers have followed this suggestion. Some of them appear as contributors to this book. Of the many who could not contribute, we in particular regret the absence of A. Ehrenfeucht, G. Herman and H.A. Maurer whose influence in the theory of L systems has been most significant.