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From the Series Libros de física para madrugadores (Early Bird Physics)
What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these… Read More →
From the Series Creative Minds Biographies
A teacher and principal, a lawyer, an entertainer, a diplomat, and a writer, James Weldon Johnson spent his entire life working to help African Americans gain the rights and respect they… Read More →