Benjamin Banneker
蓝牙网络共享Benjamin Banneker was born on November 9， 1731， in Baltimore County, Marryland. He is a farmer， mathematician, astronomer, author and land surveyor. He is also the first African-American man of science.
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He attended one of the first integrated schools， showed a great propensity for mathematics and an astounding mechanical ability。 Later, when he was forced to leave school to work the family farm， he continued to be an avid reader。 康熙良妃Banneker was largely lf—educated in astronomy by watching the stars and in mathematics by reading borrowed textbooks.用电饭锅做蛋糕 In 1790， he sold his farm and spent the rest of his life publishing his works on astronomy， mathematics and the abolition of slavery。帅哥怎么画
At age 24 he studied clockworks and constructed his own clock from wood。 Later, the Frenchman hired by George Washington to design the capital， L'Enfant, stormed off the job after a year of work， taking all the plans。 Banneker， placed on the planning committee at Thomas Jefferson's request， saved the project by reproducing from memory，
in two days, a complete layout of the streets， parks， and major buildings.valued And he published his almanac 奥数题for six concutive years between 1792 and 1797。 In the 1793 edition， Banneker included his correspondence with Thomas Jefferson， in which he challenged Jefferson’s ideas, put forth in ”Notes on the State of Virginia，" about the inferiority of "a race of Beings who have long labored under the abu and censure of the world。"
Toward the end of his life, he produced a disrtation on bees, a study of locust—plague cycles and more letters on gregationist trends in America。 In his journals, Banneker wrote and collected mathematical puzzles written in ver.
He died at age 75 in Boston in 1806。 In 1980, the U。S。 Post Office issued a Black Heritage commemorative stamp in his honor.
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