Many things that now seem to be obviuous, took at least 5 kiloyear to be discovered, described and established. - 2x10^6 year: fire, clothes (animal skins) - 30 kiloyear: Weaving, Textile, Footwear 6000 bc 2000, wheels; perhaps, invented and reinvented amy times in various countries. 5000 BC, Egypt. State-supporter roads. 3000 BC, written language. 1800 BC. Babylonian mathematical tablet (system of writing based on number 60) Concepts of counting and measuting established. Concepts of some elementary functions. 1800 BC – 1649 BC "Belin papirut" (examples in math). 776 BC idea and realization of Olympic Games as international religious-sportive events. 757 bc Homer Poetry. 570 – c. 495 BC, Pythagoras. Concepts of definitions, hypothesis, conjecture, theorem, proof. 590–561 Bc, 507–413 bc, Concept of democracy, Constitution, Athenian republic. Mechanisms of covertion of democracy to tyranny (demagogy and terror) are ivented and tested. 509 BC - 27bc, Roman republic (collapsed into the Roman empire, 27 BC – AD 286) 460 – 370 BC, Democritus , Greek: Δημόκριτος, Dēmókritos, meaning "chosen of the people"; concept pf atoms. 460 – c. 370 BC Hippocrates of Kos (/hɪˈpɒkrətiːz/; Greek: Ἱπποκράτης ὁ Κῷος, translit. Hippokrátēs ho Kôios; Surgery. 424/423 – 348/347 BC Plato Greek: Πλάτων Plátōn, 384–322 BC: Aristotle (/ærɪˈstɒtəl/;[4] Greek: Ἀριστοτέλης Aristotélēs, pronounced [aristotélɛːs]; Prior Analytics http://classics.mit.edu/Aristotle/prior.mb.txt Concept or boolean algebra, logic. 312 BC, concept of state-supported water supply. 300 BC Euclid, Systematication of math achievement, concept of postulate, axiom. 190-120 BC. Hipparchus of Nicaea (/hɪˈpɑːrkəs/; Greek: Ἵππαρχος, Hipparkhos; c. 190 – c. 120 BC) Trigoometry, astronomy. 0 Jesis from Nazareth. idea of separation of God from Church, "sepration of power". 129 – c. 216 CE, Galen Aelius Galenus or Claudius Galenus[2] (Greek: Κλαύδιος Γαληνός; September 129 – c. 216 CE), often Anglicized as Galen (/ˈɡeɪlən/) or Galen of Pergamon Anatomy. (Nerves.) 100 — 170 Claudius Ptolemy. Κλαύδιος Πτολεμαῖος, Claudius Ptolemaeus, 287—212 Archimedes.. Pi Static.. Middle Ages (493–1417) 300 - 1700, dark centuries.