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Life without Principle se llamó originalmente What Shall it Profit, y fue una conferencia dictada por Thoreau el 6 de diciembre de 1854 en el Hall del Ferrocarril de Rhode Island. Posteriormente, dictó la conferencia cuatro veces más en Massachusetts durante 1855, y una vez más en Nueva Jersey al año siguiente. La versión que tradujimos fue editada por el mismo Thoreau para su publicación en formato impreso, que realizó Atlantic Monthly en 1863, donde recibió su título actual.

Photosynthesis is the basis for all life on Earth! This exciting and sensitive book looks at how plants take a gas that is poisonous to people and animals and, with the help of the Sun, create food and oxygen for all creatures. Children will delight at learning about the little chloroplast factories inside the leaves of plants and become aware of how important plants really are! Children of all ages will love this book!

Learn more about the renowned British scientist, professor, and author who spent his entire career trying to answer the question: "Where did the universe come from?" Stephen Hawking was born exactly three hundred years after the death of the scientist Galileo, so maybe it was written in the stars that he would become a famous scientist in his own right. Although he was diagnosed with a neurological disease at age 21, Stephen did not let the illness define his life. Known for his groundbreaking work in physics, and identified by his wheelchair and computerized voice system, Stephen continued...

Este libro ilustrado para niños y jóvenes ofrece un análisis equilibrado de las creencias, la historia y las costumbres de todas las grandes religiones del mundo y de muchas doctrinas menos conocidas.