Takes readers on an interplanetary tour from the sun to the ever-mysterious Mars, and then, thanks to the Voyager missions, to the planets beyond.

Describes the origins, characteristics, and future of the sun, planets, moons, asteroids, meteoroids, and comets.

An introduction to the physical characteristics, behavior, and life cycle of different kinds of spiders.

Describes the physical characteristics and behavior of various kinds of gorillas.

Why is it important to chew your food? Can you guess how long it takes for food to travel through your body? Could you possibly have twenty feet of small intestines? Where does that bad-smelling gas come from? Your digestive system is out of sight and out of mind -- until things don't go right. Then you may wonder how these important organs work! You'll find the answers in Seymour Simon's smooth, well-organized, and fascinating introduction to the...

Describes the physical characteristics and behavior of the often misunderstood and feared sharks.