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Photographs and simple text describe the work done by mail carriers.
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Plastic is everywhere, but some experts say today's plastic will be in our landfills for thousands of years to come. Explore the good and the bad of plastic in our lives and learn how scientists are looking for new ways to produce biodegradable, Earth-friendly plastic substitutes. STEM career opportunities are featured. Includes a glossary and references for additional reading.
Plastics --- Plastic scrap --- Biodegradable plastics --- Plastics. --- Plastic scrap --- Biodegradable plastics. --- Social aspects --- Environmental aspects --- Environmental aspects.
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Life would be very different without the Internet. Our governments depend on it. There would be no use for computers or mobile phones. Airlines would shut down. What can be done to safeguard the Internet? In this book, find out how scientists are working on ways to keep the Internet open and free from interruption. STEM career opportunities are featured. Includes a glossary and references for additional reading.
Internet --- Internet --- Internet. --- Internet --- Social aspects --- Security measures --- Security measures.
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