Uzbek astronomer and mathematician Ulugh Beg (Ulug Bek, or Ulug' Bey) & a cross-section of his astronomical observatory in Samarkand, along the meridian, which produced new (more accurate than Ptolemy's) astronomical tables and a new star map (improving Hipparchus') [103] his McTutor biography
	Marie Curie (Maria Slodowskaja) Twice a Nobel prize laureate (1903, 1911) Author of fundamental scientific work on radioactive matter [786] my Curie stamps
	Isaac Newton "Philosphiae Naturalis Principia Mathematica", his greatest work. For the first time a unified system of terrestial and celestial mechanics was constructed, which became the basis of classical physics. [201] my Newton stamps