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Many people depend on blue crabs from the Chesapeake Bay for their jobs. But overfishing and changes in the blue crabs' habitats have reduced their numbers. Learn how scientists have stepped in to study these blue beauties so that they can keep a healthy crab population. Created in collaboration with the Smithsonian Institution, this Smithsonian Informational Text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step of the engineering design process and is...

Este libro nos habla del humor con conciencia y sensibilidad. Aborda con franqueza y perspicacia las sutilezas de reírnos de otros, de nosotros mismos, o de reír por reír sin ningún motivo en particular. Este libro habla tanto cuestionando lo que es apropiado o dañino, como afrontando inquietudes relacionadas a las burlas y bromas, la intimidación y agresión, ¿Qué es divertido? se centra en el desarrollo del carácter y en importantes conflictos de valores que los padres, profesores y profesionales que trabajan con niños, enfrentan hoy en día. Este título hace parte de la...

November 1940. A circus parade walks through the streets of Warsaw, waving a flag and singing. They are 160 Jewish children, forced by the Nazis to leave their beloved orphanage. It's a sad occasion, but led by Doctor Korczak, their inspirational director, the children are defiantly joyful. Their new home is in the ghetto, a prison for Jews. Two years later they board the train that will carry them away to the death camps. Offered his freedom, Doctor Korczak refuses to abandon the children and proudly joins them on their last journey. This profoundly moving illustrated book is based on the...

This fascinating narrative gets under the skin of the world’s tallest buildings! How many people are involved in creating a skyscraper? What environmental factors come into play? What does it take for a skyscraper to function? All these questions and more will be answered as we visit the skyscrapers from New York to Malaysia to China. Students will gain a deeper understanding of skyscrapers and how they shape our world.