David A Adler

Introduces readers to algebra by using simple addition, subtraction, multiplication, and division to solve equations.

Introduces triangles, discussing the different types of triangles and the concept of triangle size measured in degrees.

Traces the life of the nineteenth-century English woman who followed her calling to work in hospitals and improve the conditions under which the sick were treated.

Sometimes prices go up and up and up. Then they suddenly crash. Why? In simple language and with colorful graphics and amusing characters, this picture book explains the basic laws of supply and demand, using examples kids will understand, such as dueling lemonade stands on the same block. Terms such as "fixed costs" and "variable costs" are clearly explained, and a glossary as well as a helpful graphic summary are included.

Recounts the life of Daniel Boone, most famous for opening up the West to settlers through Kentucky, and shows how he became a symbol of America's pioneering spirit.

Uses cheese slices, pretzel sticks, a slice of bread, graph paper, a pencil, and more to introduce various polygons, flat shapes with varying numbers of straight sides.

Known as the Father of the Constitution, James Madison served two terms as the fourth president, from 1809 until 1817. Determined that all Americans be treated fairly, he devised our three branches of government and drafted the Bill of Rights. When the British set fire to Washington D.C. in 1814, his wife Dolley saved one of our country's greatest treasures, a portrait of George Washington by Gilbert Stuart which now hangs in the Smithsonian Institution,...

A biography of the inventive genius who developed the electric light bulb, the phonograph, and the motion picture.