Snedden, Robert

Surveys the most significant medical advances of the twentieth century and the ethical questions they have posed, presenting both sides of such issues as reproductive rights, organ transplants, euthanasia, and genetic engineering.

Describes the various elements that make up an environment, including the carbon cycle, the water cycle, and food chains.

Covers the inventions and technology used by ancient Egyptians and how their ideas influenced technology today.

Surveys the technological changes that have taken place during our exploration of space, discussing missiles, space stations, the space shuttle, and other developments.

Simple text, experiments, and activities introduce the scientific concept of color and how it can be found in everyday life.

Presents photographs of miscroscopic items on everyday things, enlarged thousands of times.

Explains the physical differences that make reptiles distinct from any other class of animals.

Describes the physical characteristics of mammals, including their ability to keep warm and cool, their reproduction, and the different means by which they move.

Defines amphibians and describes their lives, including their maturation, mating, sense perception, and feeding.

Describes the physical characteristics of birds, how they fly, lay eggs, and differ from other animals.