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existence
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Gottlob Frege
Discover the difference between the observable universe and the whole universe
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Plato (left) and Aristotle, detail from School of Athens, fresco by Raphael, 1508-11; in the Stanza della Segnatura, the Vatican. Plato points to the heavens and the realm of Forms, Aristotle to the earth and the realm of things.
Plato and Aristotle: How Do They Differ?
A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
14 Tough Questions Answered
Aristotle (384-322 BC), Ancient Greek philosopher and scientist. One of the most influential philosophers in the history of Western thought, Aristotle established the foundations for the modern scientific method of enquiry. Statue
Philosophers to Know, Part I
Immanuel Kant (1724-1804), German philosopher. Print published in London, 1812. Profile portrait surrounded by Ouroboros ancient Egyptian-Greek symbolic serpent with tail in mouth devouring itself representing unity of material and spiritual in eternal...
Philosophers to Know, Part II
Casino. Gambling. Slots. Slot machine. Luck. Rich. Neon. Hit the Jackpot neon sign lights up casino window.
Brain Games: 8 Philosophical Puzzles and Paradoxes
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World Data Locator Map: Australia
Is Australia an Island?
airplane in flight (plane, aircraft, flying)
7 Puzzling Plane Disappearances
Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile
6 Lost Civilizations
Bar graph of the United States Death Toll during major events. Infogram chart.
U.S. Death Toll During Major Events
Camel at Khor Rori, Oman; mammal.
Do Camels Store Water in Their Humps?
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
World map. Continents. Oceans. Mendel thumb ok
Just How Many Oceans Are There?

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Discover the difference between the observable universe and the whole universe
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