U· X· L® expands this award-winning resource! Building on theoriginal set, each new volume includes approximately 25 newscience projects/experiments covering an additional 12-15scientific concepts, as well as 50 black-and-white photos and75 drawings. Written at approximately a 7th grade level, entries range in length from four to seven pages and includedefinitions of difficult words and concepts. A favorite resource for investigating specific scientific topics, "Experiment Central "allows students and researchers toreplicate experiments and projects or consider suggestionsand ideas for altering the original experiment or creating acompletely new one. For ease-of-use and to encourage independent work, step-bystepdescriptions, hints and suggestions are provided. Unlikeother resources, "Experiment Central" also provides simpleexplanations of the theory behind the experiment. A wide range of subjects within the life, physical, environmentaland earth sciences are covered. Volumes are alphabeticallyarranged by scientific concept or theory and include: Explanation of scientific theory Purpose/hypothesis of experiment Materials needed Budget Timetable Step-by-stepinstructions Summary of results And more Features include sidebarscovering safety, troubleshooting and other aspectsof hands-on scientific research; "Words to Know"; general glossary; parent's guide; and indexes.