U- X- L(R) expands this award-winning resource Building on the original set, each new volume includes approximately 25 new science projects/experiments covering an additional 12-15 scientific concepts, as well as 50 black-and-white photos and 75 drawings. Written at approximately a 7th grade level, entries range in length from four to seven pages and include definitions of difficult words and concepts. A favorite resource for investigating specific scientific topics, Experiment Central allows students and researchers to replicate experiments and projects or consider suggestions and ideas for altering the original experiment or creating a completely new one. For ease-of-use and to encourage independent work, step-bystep descriptions, hints and suggestions are provided. Unlike other resources, Experiment Central also provides simple explanations of the theory behind the experiment.A wide range of subjects within the life, physical, environmental and earth sciences are covered. Volumes are alphabetically arranged by scientific concept or theory and include: Explanation of scientific theory Purpose/hypothesis of experiment Materials needed Budget Timetable Step-by-step instructions Summary of results And moreFeatures include sidebars covering safety, trouble shooting and other aspects of hands-on scientific research; Words to Know; general glossary; parent's guide; and indexes.