Andrew Pace
The internet has been around for over 50 years, with its origins dating back to the 1960s as a government weapon and military defense system in the Cold War. The internet has evolved over time, with the contributions of many scientists, engineers, and programmers, and the development of various technologies. Email has been around since the 1960s, file sharing since the 1970s, and the creation of the World Wide Web in 1989 revolutionized communication. As of 2021, the number of active internet users reached 4.66 billion people, representing half of the global population, and it is expected that internet usage will continue to grow.
| Characteristics | Values |
|---|---|
| Age of the Earth | 4.5 billion years |
| Oldest hominins | 7 million years B.C.E. |
| Earliest species of Homo genus | 2 million to 1.5 million years B.C.E. |
| Modern Homo sapiens | Appeared around 190,000 years B.C.E. |
| Global population in 1 C.E. | 300 million |
| Global population in 1650 | 500 million |
| Global population in 1800 | 1 billion |
| Global population in 2022 | 8 billion |
| Life expectancy at birth for most of human history | 10 years |
| Average life expectancy in Iron Age France (800 B.C.E. to 100 C.E.) | 10-12 years |
| Birth rate in Iron Age France (800 B.C.E. to 100 C.E.) for species survival | 80 live births per 1000 people |
| High birth rate today | 35-45 live births per 1000 population |
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What You'll Learn
- Language — around for 200,000 years, with 7000 languages spoken today
- Humans — 1.8 million years, evolving from upright-walking apes
- Earth — 4.54 billion years old, with early life possibly starting 4.4 billion years ago
- The Universe — 13.8 billion years old, starting with the Big Bang
- Life — the oldest fossils are 580 million years old, but life may have started much earlier
Language — around for 200,000 years, with 7000 languages spoken today
Language has been around for at least 135,000 years, with some estimates placing the evolution of language as far back as 200,000 years ago. Language is believed to have originated when humans developed the cognitive ability to combine vocabulary and grammar into a system, generating an infinite number of rules-based expressions. This unique human capacity for language is thought to have resulted from the descent of the larynx, which lengthened the vocal tract and enabled the production of a wider variety of speech sounds, particularly subtle distinctions among vowel sounds.
The evolution of language is closely tied to the development of symbolic thinking and modern human behavior. One theory suggests that language served as a trigger for innovative behaviors, with people learning from each other and encouraging new ideas. This theory highlights the role of language in the spread of agriculture and the formation of larger, more prosperous farming societies. The expansion of these agriculturalists likely contributed to the decline in linguistic diversity, as smaller linguistic groups were replaced.
While the exact timeline of language evolution remains a mystery, scholars have proposed various theories for how language may have originated. One theory suggests that language began with the imitation of sounds, such as animal calls and nature sounds, which eventually evolved into words and sentences. Another theory proposes that language started with hand gestures and body movements, which later developed into sign languages. These sign languages then gradually incorporated vocalizations, leading to the spoken languages we know today.
Today, there are approximately 7,000 languages spoken around the world, showcasing the vast linguistic diversity that has evolved over millennia. The study of language evolution and its relationship with human history continues to fascinate scholars, providing valuable insights into the unique capacity for language that distinguishes our species.
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Humans — 1.8 million years, evolving from upright-walking apes
Humans, or Homo sapiens, have been around for approximately 1.8 million years, evolving from upright-walking apes. The evolution of humans is a lengthy process of change, with scientific evidence showing that our physical and behavioural traits evolved from apelike ancestors over a period of around six million years. The first defining human trait, bipedalism, or the ability to walk on two legs, evolved over four million years ago. Other important characteristics, such as large and complex brains, the ability to make and use tools, and the capacity for language, developed more recently.
Modern Homo sapiens appeared around 190,000 BCE, originating in Africa. The earliest fossils of early humans, dating back between six and two million years ago, have been found exclusively in Africa. Scientists have identified between 15 and 20 different species of early humans, but there is debate regarding their relationships and which species left living descendants. The majority of early human species left no living descendants, and many became extinct.
The dispersal of early Homo sapiens began soon after their emergence, with evidence of their presence in North Africa around 315,000 years ago and in West Asia around 270,000 years ago. The recent out-of-Africa migration occurred between 70,000 and 50,000 years ago, when early humans migrated to Eurasia, reaching Arabia, South Asia, Maritime South Asia, Oceania, Europe, East Asia, and North Asia. Some evidence suggests that humans may have reached the Americas by 40,000 to 25,000 years ago and Australia within the last 60,000 years.
Humans are characterised by their hairlessness, bipedalism, and high intelligence. Our large brains enable us to develop sophisticated tools, form complex social structures, and adapt to varied environments. Humans are highly social, belonging to multilayered networks of distinct social groups, which contribute to the development of values, social norms, languages, and traditions. Trade, or the voluntary exchange of goods and services, is a characteristic that differentiates humans from other animals and has been cited as a major advantage for Homo sapiens over other hominids. Early humans utilised long-distance trade routes to exchange goods and ideas, fostering cultural explosions and providing additional food sources.
The human population has grown significantly over time, driven by advancements in public health, medicine, and nutrition. Humans are now a cosmopolitan species, found in almost all regions of the world, adapting to a wide range of temperatures, humidities, and altitudes with the use of advanced tools and clothing.
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Earth — 4.54 billion years old, with early life possibly starting 4.4 billion years ago
The Earth is thought to be about 4.54 billion years old. It formed from a mixture of dust and gas around the young sun, which eventually became a disc of dust that grew into "planetesimals". These are tens to hundreds of miles across and then grew into Mars-sized "protoplanets" by colliding with each other. The final stage of planet formation may have taken up to 100 million years.
The Earth continued to experience impacts throughout its early life. During a period called the Late Heavy Bombardment, there was an increased rate of asteroid and comet impacts in the inner Solar System. This likely happened between 4.1 and 3.8 billion years ago. The impact that occurred during this period was so large that it threw enough rock, gas, and dust into space to form the moon. This is known as the "moon-forming impact".
The age of the Earth has been determined through radiometric dating of rocks and minerals, examining layers of sedimentary rock, and studying the Earth's magnetic field. The most precise method is radiometric dating, which measures the decay of radioactive isotopes in rocks. By looking at the ratio of parent (pre-decay) and daughter (post-decay) isotopes in a sample, scientists can determine the age of a rock.
Early life on Earth possibly started 4.4 billion years ago. Experiments that simulated the conditions of the early Earth have reported the formation of lipids, which can spontaneously form liposomes, double-walled "bubbles", and then reproduce themselves.
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The Universe — 13.8 billion years old, starting with the Big Bang
The age of the universe is determined by the expansion rate of the cosmos and the standard model of cosmology. The universe is currently expanding, and this has been the case since the Big Bang. This means that in the past, everything in the universe was closer together. If we continue to rewind, we reach a point where the universe originated from a single point in space and time. This moment, known as the Big Bang, is estimated to have occurred around 13.8 billion years ago, marking the beginning of the universe as we know it.
The concept of the Big Bang was a breakthrough idea that transformed our understanding of the universe's origins. It proposes that the universe began as an extremely dense and hot fireball that exploded. This initial expansion happened faster than the speed of light and is known as cosmic inflation. While the cause of this explosion remains a mystery, the Big Bang theory provides a framework for explaining the subsequent evolution of the universe.
In the early stages after the Big Bang, the universe consisted mainly of gas, primarily hydrogen and helium. This gas expanded and cooled over billions of years, leading to the formation of galaxies, stars, and planets through the gravitational attraction of gas and dust. The matter that spread out from the Big Bang eventually developed into everything we observe in the universe today.
While the Big Bang theory is widely accepted, there is still ongoing research and uncertainty regarding the specifics of the early universe. Different methods of measurement can yield varying estimates for the age of the universe, and there are complexities in understanding the microseconds and early progression after the Big Bang. Additionally, the concept of existence itself extends beyond our current understanding.
Nevertheless, it is clear that the universe as we know it has been around for billions of years, and we have gained significant insights into its evolution and structure. The study of cosmology continues to advance our knowledge and deepen our understanding of the universe's age, origins, and ongoing expansion.
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Life — the oldest fossils are 580 million years old, but life may have started much earlier
The oldest fossils ever found are dated to be around 580 million years old, belonging to the Ediacaran Period. These fossils were of sponges and other seafloor creatures with body shapes resembling fronds, ribbons, and quilts. However, it is speculated that life may have started much earlier.
The Earth is estimated to be around 4.5 billion years old, and it is believed that by 4.3 billion years ago, the Earth may have developed conditions suitable to support life. The earliest life forms were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years ago. The signals consisted of a type of carbon molecule that is produced by living things. Evidence of microbes was also preserved in the hard structures ("stromatolites") they made, which date back to 3.5 billion years ago. Stromatolites are created as sticky mats of microbes trap and bind sediments into layers.
Additionally, there is evidence of life from chemical traces in rocks from Canada, which may indicate the presence of life from a deep-sea vent. These traces are estimated to be around 4.2 billion years old. Furthermore, fossils of algae have been found in rocks dated between 1.5 and 1.85 billion years old, indicating that complex life forms had already evolved by this time.
The origin of life on Earth is still a mystery, and scientists continue to explore the essential ingredients and conditions necessary for life to emerge. While the oldest fossils provide valuable insights into the history of life, it is clear that life on Earth may have begun much earlier than the fossils suggest.
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Frequently asked questions
Bread is one of the oldest human-made foods, with the earliest evidence of bread-making dating back 14,500 years to a Natufian site in Jordan. There is also evidence from 30,000 years ago in Europe and Australia, which suggests that starch extract from plants may have been cooked into a primitive form of flatbread.
The use of fire dates back at least 1 million years. Burned flints discovered in Morocco, dated to around 300,000 years ago, were found alongside skulls of early Homo sapiens. Evidence of fire use has also been discovered in China, Israel, India, Spain, France, and England, with some sites dating back hundreds of thousands of years.
Tea drinking became established in China many centuries before it was introduced to the West. Containers for tea found in tombs from the Han dynasty (206 BC - 220 AD) indicate that tea was consumed during this period. However, it was under the Tang dynasty (618-906 AD) that tea became the national drink of China.
The wheel was invented in the 4th century BC in Mesopotamia (modern-day Iraq) by the Sumerian people. The innovation of hollowing out the wooden discs to make them lighter in 2000 BC led to significant advancements in transportation and mechanised agriculture.
Knives, one of the earliest tools used by humanity, have been around for at least 2.5 million years. Originally made from wood, bone, and stone, knife blades have evolved over time, incorporating materials such as copper, bronze, iron, steel, ceramic, and titanium.
