0Eighteenth-century mathematician and astronomer Benjamin Banneker was widely known and respected in his time. Most of what he knew, he taught himself. His letter to Thomas Jefferson asked the future president to reconsider his racial prejudices. Learn about Banneker, who abolitionists would use as proof that people of any race can be equally intelligent. Additional features include detailed captions and sidebars, critical-thinking questions, a phonetic glossary, an index, and sources for further research.