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René Descartes
René Descartes (1596-1650) was a French mathematician, natural scientist, and philosopher, best known by the phrase 'Cogito ergo sum' ('I think therefore I am'). He published works on optics, coordinate geometry, physiology, and cosmology...

Definition
Nicolaus Copernicus
Nicolaus Copernicus (1473-1543 CE) was a Polish astronomer who famously proposed that the Earth and other planets revolved around the Sun in a heliocentric system and not, as then widely thought, in a geocentric system where the Earth is...

Definition
Euclid
Euclid of Alexandria (lived c. 300 BCE) systematized ancient Greek and Near Eastern mathematics and geometry. He wrote The Elements, the most widely used mathematics and geometry textbook in history. Older books sometimes confuse him with...

Definition
Mesopotamian Science and Technology
Mesopotamian science and technology developed during the Uruk Period (4100-2900 BCE) and Early Dynastic Period (2900-1750 BCE) of the Sumerian culture of southern Mesopotamia. The foundation of future Mesopotamian advances in scientific/technological...

Definition
Gottfried Wilhelm Leibniz
Gottfried Wilhelm Leibniz (1646-1716) was a German polymath who became well-known across Europe for his work, particularly in the fields of science, mathematics, and philosophy. Leibniz's rationalist philosophy attempted to reconcile traditional...

Definition
Kassite
It is thought that the Kassites originated as tribal groups in the Zagros Mountains to the north-east of Babylonia. Their leaders came to power in Babylon following the collapse of the ruling dynasty of the Old Babylonian Period in 1595 BC...

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Mesopotamian Inventions
Mesopotamian inventions include many items taken for granted today, most of which were created during the Early Dynastic Period (2900-2334 BCE) or developed from achievements of the Uruk Period (4100-2900 BCE). The Sumerians are credited...

Definition
Kingdom of Israel
The Kingdom of Israel occupied that part of the land on the Mediterranean Sea known as the Levant which corresponds roughly to the State of Israel of modern times. The region was known, historically, as part of Canaan, as Phoenicia, as Palestine...

Definition
Eratosthenes
Eratosthenes (l. c. 276-195 BCE) was a Greek astronomer, geographer, mathematician, and poet best known for being the first to calculate the circumference of the earth and its axial tilt. He is also recognized for his mathematical innovation...

Definition
Menelaus of Alexandria
Menelaus of Alexandria was a Greek astronomer, scientist, and mathematician who lived around 100 CE. Menelaus made a significant and lasting contribution to the fields of astronomy, geometry, and trigonometry. His major work, the Spherics...