Ask Isaac Asimov

Explains why the moon changes from crescent to full moon every twenty-nine and one-half days.

Discusses why certain animals have become endangered and what can be done to keep them from becoming extinct.

Describes the characteristics and value of tropical rain forests, why they are disappearing, and how to save them.

Explains why stars in the night sky appear to twinkle.

A step-by-step description of how an eclipse occurs and the differences between a lunar and a solar eclipse.

Discusses how litter damages the environment and how to dispose of it properly.

Discusses the causes and damaging effects of oil spills and ways to protect the land and sea from oil pollution.