Master Timeline
The Maya civilization, emerging around 2600 BCE in what is now Mexico, Belize, Guatemala, and Honduras, represents one of the most complex societies of ancient America. Renowned for their achievements in mathematics, astronomy, art, and architecture, the Maya developed a sophisticated calendar system and constructed towering pyramids and cities that blended harmoniously with the surrounding […]
The Rise of the Maya Civilization Read More »
In what is now the United States, the Clovis culture, named after distinctive stone tools found near Clovis, New Mexico, represents one of the earliest known sophisticated societies in the Americas. Dating back to around 13,000 BCE, the Clovis people are believed to be among the first inhabitants of the continent, crossing the Bering Land
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In the early 12th century, the Khmer Empire, located in what is today Cambodia, undertook one of the most ambitious architectural projects in the history of Southeast Asia: the construction of Angkor Wat. Originally dedicated to the Hindu god Vishnu, this temple complex reflects the height of Khmer architectural, artistic, and spiritual achievement. Angkor Wat
In 322 BCE, following the disruption left in the wake of Alexander the Great’s incursions into the Indian subcontinent, Chandragupta Maurya founded the Maurya Empire. This marked the beginning of one of India’s largest and most powerful empires, stretching at its zenith from the Himalayas to the Deccan Plateau. The reign of Chandragupta and his
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In the lush, fertile lands of the Yangtze River Valley in ancient China, early inhabitants achieved a milestone that would revolutionize human society: the domestication of rice. Around 8,000 BCE, these innovative communities began to cultivate wild rice, laying the groundwork for sedentary agriculture and complex civilizations. This agricultural breakthrough not only provided a stable
The Domestication of Rice Read More »
The Māori, Polynesian navigators and explorers, reached the shores of Aotearoa, now known as New Zealand, around 1300 CE. Braving the vast Pacific aboard large, ocean-going waka (canoes), they established communities that would flourish into a distinctive culture deeply connected to the land and sea. The Māori developed a rich oral tradition, weaving tales of
The Māori Settlement of New Zealand: Earliest Known Read More »
The Lapita culture, named after a site in New Caledonia, was an Austronesian people known for their intricate pottery and advanced navigation skills. Around 1500 BCE, they began spreading eastwards across the vast Pacific, reaching as far as Tonga and Samoa. The Lapita are considered the ancestors of many modern Pacific Islanders, including Polynesians, Micronesians,
The Lapita Culture Read More »
2,600 Generations Ago (from 2020 CE) Long before the sails of European explorers dotted the horizon, the Australian continent witnessed the arrival of its first human inhabitants. Archaeological evidence, such as ancient tools and cave art, suggests that people arrived in Australia at least 65,000 years ago, marking one of the earliest known human migrations
The Settlement of Australia Read More »
30 Phil, Chapter 1 Touchstone 1 of 80: Big Bang. Immediately following the state of the singularity, the universe entered a phase of rapid expansion and cooling, known as the Big Bang Expansion. This critical period signifies not an explosion in space but the very expansion of space itself, from an incomprehensibly dense point known
Big Bang Expansion Read More »
About 3.85 billion years ago, the RNA world resembled a molecular wild west: replicators drifted. When chemistry favored a structure, it binded.
About 3.9 million years ago RNA-based protocells evolved. Likely with a mix of random DNA experiments.
Assembly of Protocells Read More »
Alongside or following the chemical evolution of organic molecules, the formation of prebiotic microenvironments, such as hydrothermal vents or warm little ponds, provided niches where concentrations of organic molecules could interact. These environments could have been crucial for the assembly of complex organic molecules and the initiation of catalytic cycles.
Formation of Prebiotic Microenvironments Read More »
While the 4.4 billion years ago is a guess as to when these processes might have started, the 4.1 billion years ago guess is a better representatoin of current understanding on when the needed building blocks of life evolved. Before the appearance of self-replicating molecules, there was a crucial phase of chemical evolution where simple
Chemical Evolution of Organic Molecules Read More »
About 4.2 billion years ago, chemical reactions in high temperature environments start replicating. Not life, just replication.
First Life: Self-Replicating Molecules Read More »
The formation of cellular membranes represents a pivotal development in the pre-life world, enabling the creation of defined boundaries for primitive cells. These membranes, likely formed from simple lipid bilayers, provided a controlled environment for chemical reactions and played a critical role in the emergence of the first cell-like structures, distinguishing them from their surrounding
Cellular Membranes Read More »
Metabolism-First life theories suggest life began as a series of self-sustaining chemical reactions trapped in rock pores about 4.1 billion years ago.
Metabolic Pathways Read More »
In evolutionary order, reproduction systems came first; bodies came later. Around 1.1 billion years ago, some single-celled eukaryotes evolved gamete specialization. Instead of two similar cells fusing, one became small and motile (sperm-like) while the other became larger and nutrient-rich (egg-like). These were not separate organisms but reproductive forms of single-celled life. Hundreds of millions
Oogamy: Early Gamete Specialization Before Animals Read More »
An example of early live birth is the protomammal Kayentatherium, Jurassic period. The switch to live birth in mammals, including marsupials and placentals, evolved from a common ancestor.
Mammals: First Live Births Read More »
The amniotic egg evolved in the first amniotes, which evolved into today’s reptiles, birds, and mammals.
Amniotes Emerge: Amniotic Eggs Read More »
The evolution of egg-laying evolved before fish. It is thought to have developed with or shortly after the emergence of the first multicellular animals, around 640 million years ago. Kingdom: Animalia > Phylum: Porifera (sponges) and Cnidaria (jellyfish, corals, etc.)
First Animal Egg Layers Read More »
