An introduction to the science of speleology is presented. Discussed is why people explore caves--for the physical challenge, the thrill of discovery, and the joy of viewing their beauty. Cave conservation, cave biology, caving safety, and caving equipment are topics of discussion. A reading list on caves is included. (KR)

Hawaii's Volcanoes National Park is described using pictures and words. Information on the formation and movement of the Hawaiian Islands is provided. A travel guide to the volcanic sites is included. (KR)

Suggestions and tips for novice and experienced eclipse watchers are provided. Discussed are the mysterious shadow bands that occur just minutes before an eclipse. Directions for building a deluxe pinhole projector for observing the eclipse, a reading list, and a glossary of related terms are included. (KR)

Described is how an ordinary FM radio or television receiver can indicate when a meteor streaks overhead by receiving distant broadcast signals. Temperature inversions and the presence of ionized clouds can also be detected using receivers. Information on the troposphere and ionosphere and directions for the activity are included. (KR)

Information on how a shortwave radio can be used to make empirical observations about solar activity and the Earth's geomagnetic field is provided. How to interpret transmissions of shortwave propagation information, weather conditions, and highly accurate time signals from shortwave stations is discussed. (KR)