Master Timeline
The groundbreaking discovery that humans were making bread 14,000 years ago, before the advent of agriculture, was published in 2018. Since grain is easy to grow, does this suggest agriculture might have started a few thousand years earlier? Under study, but the discovery of bread-making from around 14,000 years ago indeed suggests that humans were experimenting […]
Bread Making Pushed Back Read More »
Since grain is easy to grow, does this suggest agriculture might have started a few thousand years earlier? Under study, but the discovery of bread-making from around 14,000 years ago indeed suggests that humans were experimenting with grains before the widespread adoption of agriculture, which is traditionally dated to about 12,000 years ago with the
The Invention of Bread Read More »
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
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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
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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,
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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
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Following the appearance of self-replicating molecules, the RNA world hypothesis suggests a period where RNA served both as genetic material and as a catalyst for chemical reactions. This phase emphasizes the central role of RNA in early life forms, prior to the evolution of DNA and proteins. The RNA world could be considered both a
Between the development of metabolic pathways and the formation of cellular membranes, there might have been a phase involving the assembly of protocells. These protocells, formed from self-assembled lipid molecules creating vesicles, could encapsulate nucleic acids and metabolic molecules, offering a primitive model for cell-like structures. Protocells represent a bridge between non-living chemical systems and
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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.
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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 »
The appearance of self-replicating molecules, such as RNA or similar nucleic acid analogues, signified a monumental leap towards life. These molecules had the ability to store genetic information and catalyze their own replication, laying the foundational mechanism for heredity and evolution by natural selection, driving the complexity forward towards the emergence of life as we
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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
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Before the diversification of life, the establishment of basic metabolic pathways marked a crucial step towards biochemistry that supports life. These pathways allowed the conversion of inorganic and simple organic molecules into more complex compounds, setting the stage for energy transfer and the synthesis of key biomolecules necessary for cellular processes.
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Sexual reproduction, genetic material from two parents, emerged as a fundamental evolutionary innovation of eukaryotes. The emergence of sexual reproduction in the Domain Eukaryota highlights the unique properties of eukaryotic cells. Eukaryotes have Complex Cell Structure, chromosomes within a nucleus, meiosis, a special type of cell division that reduces the chromosome number by half and creates genetic
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An example of early live birth is the protomammal Kayentatherium, Jurassic period. This cynodont is related to early mammals and its clutch size suggested egg-laying, providing clues about the transition to live birth. The switch to live birth in mammals, including marsupials and placentals, likely evolved once at their common ancestor, suggesting live birth in mammals
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