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<h1>Visualized: The 4 Billion Year Path of Human Evolution</h1>
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<p><img src="https://www.visualcapitalist.com/wp-content/uploads/2023/04/Human-Evolution_VF.png" class="ss-hidden-pin-image" alt="" /> </p>
<p>The story of human evolution is a fascinating one, stretching back in an unbroken chain over millions of <a href="https://www.visualcapitalist.com/cp/nature-timespiral-the-evolution-of-earth-from-the-big-bang/">years</a>. </p>
<p>From the tiniest protocells to modern humans, our species has undergone a remarkable journey of adaptation, innovation, and survival.</p>
<p>In this article, we take a look at the key developmental stages in the evolution of <a href="https://www.visualcapitalist.com/all-the-biomass-of-earth-in-one-graphic/">life on Earth</a> that led to the emergence of <em>Homo sapiens</em>—us!</p>
<h2>From Protocells to People</h2>
<p>Evolution is the result of millions of minute mutations over millions of years, but the evolutionary process that created us can bucketed into a few key categories.</p>
<p><img decoding="async" src="https://www.visualcapitalist.com/wp-content/uploads/2023/04/keyevolutionarystages.png" alt="Key Evolutionary Stages of Human Evolution" width="820" height="287" class="alignnone size-full wp-image-157563" srcset="https://www.visualcapitalist.com/wp-content/uploads/2023/04/keyevolutionarystages.png 820w, https://www.visualcapitalist.com/wp-content/uploads/2023/04/keyevolutionarystages-768x269.png 768w" sizes="(max-width: 820px) 100vw, 820px" /></p>
<h4>1. Protocells and Early Microorganisms</h4>
<p>The first life forms on Earth were simple, single-celled <a href="https://www.visualcapitalist.com/the-many-shapes-of-bacteria/">microorganisms</a> known as protocells. These precursor cells lacked a nucleus or other membrane-bound organelles, and they had simple genetic proteins called RNA.</p>
<p>Over time, RNA complexified into the more stable <a href="https://www.visualcapitalist.com/cp/basics-of-dna-and-genetic-systems/">DNA</a>. Protocells slowly developed specialized organelles, becoming more complex microbes that would eventually form eukaryotes &#8211; the complex, unicellular organisms that would birth a diverse array of life forms, from simple sponges to complex animals.</p>
<h4>2. The First Animals</h4>
<p><em>Dickinsonia </em>is the earliest example of an animal we know of. Though it was a simple, flat creature that lacked a mouth or digestive system, it symbolizes the first multicellular organism of substantial complexity.</p>
<p>Over time, the first sophisticated organ systems began to arise. Bilateral symmetry emerged, as well as early versions of the nervous and circulatory systems. Simple eyes, called <a href="https://www.visualcapitalist.com/eye-evolution/">eyespots</a>, also appeared around the time that spinal cords and vertebrate creatures began to emerge.</p>
<h4>3. Fish and Tetrapods</h4>
<p>One of the most significant developments in the evolution of life was the transition from marine to terrestrial environments.</p>
<p>Up until 500 million years ago, all life was sequestered in the sea. Fish were the first vertebrates and introduced additional organs like stomachs, spleens, and body components like scales, teeth, blood, and more. Bony fish arose, and over time their development brought about sophisticated changes to the skeletal system, eventually producing “proto-limbs” that would enable organisms to walk on land. </p>
<p>Researchers are still unsure which specific organism might have first crawled on land, but candidates share these pre-limb characteristics. Tiktaalik is one popular candidate because it had specialized bones that suggest it could support its own weight while moving out of shallow waters.</p>
<p>These creatures eventually became the <strong>tetrapods</strong> (“four-footed&#8221;), and they had features like four-legs, a backbone, and lungs which could absorb oxygen from air. All the amphibians, reptiles, birds, and mammals that followed are descendants of the original tetrapods.</p>
<h4>4. The First Mammals</h4>
<p>Around 200 million years ago, the first mammals emerged. These early mammals were small, <a href="https://www.livescience.com/26936-mother-placental-mammals-infographic.html" rel="noopener" target="_blank">shrew-like creatures</a> that lived alongside the dinosaurs. Over time, however, mammals evolved hair, specialized teeth, sweat glands to regulate body temperature, and a more efficient circulatory system.</p>
<p>Mammals also brought about features like nocturnality, mammary glands, external genitalia, and a variety of other features that distinguished them from other living species at the time, like birds or reptiles.</p>
<h4>5. The Great Apes and First <em>Homo </em>Species</h4>
<p>Around 7 million years ago, the first great apes emerged in Africa. These apes, such as orangutans, gorillas, and chimpanzees, were highly intelligent and social creatures that lived in complex communities. Over time, one lineage of apes would give rise to the first members of the genus <em>Homo</em>, which includes our own species.</p>
<p>The main developmental changes during this time were the full-time bipedalism of apes, increasing brain size, and advanced bone development that enabled dexterity for tool construction and hunting. Inventions like fire and clothing arose early in the <em>Homo</em> genus, and eventually complex language, hair loss, and dramatic facial changes would evolve.</p>
<p>Researchers struggle with resolving the exact progression of the <em>Homo </em>species. Many <em>Homo </em>species existed at the same time, and since many fossil records overlap, resolving which ones came first is an area of intense focus.</p>
<h2> The Future of Human Evolution </h2>
<p>As humans continue to evolve, we can expect to see significant changes in our physical and cognitive abilities over the next 10,000 years.</p>
<p>With the rise of technology and the increasing interconnectedness of the world, we may see a shift towards a more globalized and homogeneous human population, with less genetic diversity.</p>
<p>This has been described as &#8220;The Great Averaging”, where genetic diversity minimizes and we start to become more alike.</p>
<p>Other theories suggest that we might develop features like a taller, lighter build, with smaller brains and a less aggressive personality.</p>
<p>However, as with all evolution, these changes will be shaped by a complex interplay of genetic, environmental, and cultural factors. It is impossible to predict exactly how humans will evolve over the next 10,000 years, but one thing is certain: the future of human evolution will be shaped by the choices we make today.</p>
<p><em>Note: This is a complex topic with new research being published all the time. We’ll continue to dynamically update this graphic to reflect the most recent understanding of evolution.</em></p>
</article>


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title: Visualized: The 4 Billion Year Path of Human Evolution
url: https://www.visualcapitalist.com/path-of-human-evolution/
hash_url: 58bdc0bd6ed37d5990d24384ee40022b

<img src="https://www.visualcapitalist.com/wp-content/uploads/2023/04/Human-Evolution_VF.png" class="ss-hidden-pin-image" alt="" />

<p>The story of human evolution is a fascinating one, stretching back in an unbroken chain over millions of <a href="https://www.visualcapitalist.com/cp/nature-timespiral-the-evolution-of-earth-from-the-big-bang/">years</a>. </p>
<p>From the tiniest protocells to modern humans, our species has undergone a remarkable journey of adaptation, innovation, and survival.</p>
<p>In this article, we take a look at the key developmental stages in the evolution of <a href="https://www.visualcapitalist.com/all-the-biomass-of-earth-in-one-graphic/">life on Earth</a> that led to the emergence of <em>Homo sapiens</em>—us!</p>
<h2>From Protocells to People</h2>
<p>Evolution is the result of millions of minute mutations over millions of years, but the evolutionary process that created us can bucketed into a few key categories.</p>
<p><img decoding="async" src="https://www.visualcapitalist.com/wp-content/uploads/2023/04/keyevolutionarystages.png" alt="Key Evolutionary Stages of Human Evolution" width="820" height="287" class="alignnone size-full wp-image-157563" srcset="https://www.visualcapitalist.com/wp-content/uploads/2023/04/keyevolutionarystages.png 820w, https://www.visualcapitalist.com/wp-content/uploads/2023/04/keyevolutionarystages-768x269.png 768w" sizes="(max-width: 820px) 100vw, 820px" /></p>
<h4>1. Protocells and Early Microorganisms</h4>
<p>The first life forms on Earth were simple, single-celled <a href="https://www.visualcapitalist.com/the-many-shapes-of-bacteria/">microorganisms</a> known as protocells. These precursor cells lacked a nucleus or other membrane-bound organelles, and they had simple genetic proteins called RNA.</p>
<p>Over time, RNA complexified into the more stable <a href="https://www.visualcapitalist.com/cp/basics-of-dna-and-genetic-systems/">DNA</a>. Protocells slowly developed specialized organelles, becoming more complex microbes that would eventually form eukaryotes &#8211; the complex, unicellular organisms that would birth a diverse array of life forms, from simple sponges to complex animals.</p>
<h4>2. The First Animals</h4>
<p><em>Dickinsonia </em>is the earliest example of an animal we know of. Though it was a simple, flat creature that lacked a mouth or digestive system, it symbolizes the first multicellular organism of substantial complexity.</p>
<p>Over time, the first sophisticated organ systems began to arise. Bilateral symmetry emerged, as well as early versions of the nervous and circulatory systems. Simple eyes, called <a href="https://www.visualcapitalist.com/eye-evolution/">eyespots</a>, also appeared around the time that spinal cords and vertebrate creatures began to emerge.</p>
<h4>3. Fish and Tetrapods</h4>
<p>One of the most significant developments in the evolution of life was the transition from marine to terrestrial environments.</p>
<p>Up until 500 million years ago, all life was sequestered in the sea. Fish were the first vertebrates and introduced additional organs like stomachs, spleens, and body components like scales, teeth, blood, and more. Bony fish arose, and over time their development brought about sophisticated changes to the skeletal system, eventually producing “proto-limbs” that would enable organisms to walk on land. </p>
<p>Researchers are still unsure which specific organism might have first crawled on land, but candidates share these pre-limb characteristics. Tiktaalik is one popular candidate because it had specialized bones that suggest it could support its own weight while moving out of shallow waters.</p>
<p>These creatures eventually became the <strong>tetrapods</strong> (“four-footed&#8221;), and they had features like four-legs, a backbone, and lungs which could absorb oxygen from air. All the amphibians, reptiles, birds, and mammals that followed are descendants of the original tetrapods.</p>
<h4>4. The First Mammals</h4>
<p>Around 200 million years ago, the first mammals emerged. These early mammals were small, <a href="https://www.livescience.com/26936-mother-placental-mammals-infographic.html" rel="noopener" target="_blank">shrew-like creatures</a> that lived alongside the dinosaurs. Over time, however, mammals evolved hair, specialized teeth, sweat glands to regulate body temperature, and a more efficient circulatory system.</p>
<p>Mammals also brought about features like nocturnality, mammary glands, external genitalia, and a variety of other features that distinguished them from other living species at the time, like birds or reptiles.</p>
<h4>5. The Great Apes and First <em>Homo </em>Species</h4>
<p>Around 7 million years ago, the first great apes emerged in Africa. These apes, such as orangutans, gorillas, and chimpanzees, were highly intelligent and social creatures that lived in complex communities. Over time, one lineage of apes would give rise to the first members of the genus <em>Homo</em>, which includes our own species.</p>
<p>The main developmental changes during this time were the full-time bipedalism of apes, increasing brain size, and advanced bone development that enabled dexterity for tool construction and hunting. Inventions like fire and clothing arose early in the <em>Homo</em> genus, and eventually complex language, hair loss, and dramatic facial changes would evolve.</p>
<p>Researchers struggle with resolving the exact progression of the <em>Homo </em>species. Many <em>Homo </em>species existed at the same time, and since many fossil records overlap, resolving which ones came first is an area of intense focus.</p>
<h2> The Future of Human Evolution </h2>
<p>As humans continue to evolve, we can expect to see significant changes in our physical and cognitive abilities over the next 10,000 years.</p>
<p>With the rise of technology and the increasing interconnectedness of the world, we may see a shift towards a more globalized and homogeneous human population, with less genetic diversity.</p>
<p>This has been described as &#8220;The Great Averaging”, where genetic diversity minimizes and we start to become more alike.</p>
<p>Other theories suggest that we might develop features like a taller, lighter build, with smaller brains and a less aggressive personality.</p>
<p>However, as with all evolution, these changes will be shaped by a complex interplay of genetic, environmental, and cultural factors. It is impossible to predict exactly how humans will evolve over the next 10,000 years, but one thing is certain: the future of human evolution will be shaped by the choices we make today.</p>
<p><em>Note: This is a complex topic with new research being published all the time. We’ll continue to dynamically update this graphic to reflect the most recent understanding of evolution.</em></p>

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<p>This page will show you how to turn a $199.95 (Canadian – Suggested Retail) pair of <a href="http://www.sennheiser.ca/live/senn/produit/en/104/160">Sennheiser HD 555</a> headphones into a pair of <a href="http://www.sennheiser.ca/live/senn/produit/en/105/160">Sennheiser HD 595</a>‘s that cost $349.95. And all you need is a screwdriver.</p>
<h2>Intro</h2>
<p>Instead of designing a completely new product to fit a certain price range, large scale manufacturing dictates that it is often cheaper to simply “cripple” an existing high-end product. This way the manufacturer can use existing molds, parts, assembly lines and training, etc. In electronic products, firmware is usually crippled to omit/hide certain features. For example, digital camera companies reserve functions (like RAW output, exposure and white balance bracketing, long exposures, etc.) for their higher priced cameras, even though their cheapest camera has the same capabilities (See the <a href="http://chdk.wikia.com/wiki/CHDK">CHDK project</a> for more info). </p>
<h2>Comparing HD555 to HD595</h2>
<p>Thanks to the people at <a href="http://www.head-fi.org">head-fi.org</a>, I was able to find someone willing to take apart their expensive HD595 headphones so I could compare them to my moderately priced HD 555 headphones. Here are the photos:</p>

<h2>What are the differences?</h2>
<p>Aside from the aesthetic differences, the only physical difference was an additional piece of foam inside the cheaper HD555 headphones, blocking about 50% of the outside-facing vents. Since both the HD 555 and HD 595 are designed to be “open” headphones, reducing the vent with this foam would alter the frequency response slightly. <strong>So to save yourself $150, open your HD 555’s up and remove the foam. </strong> Done.</p>
<h2>How to do the mod</h2>
<p>The foam cushions are removed simply by pulling on them. From there, use a screwdriver to remove the driver assembly. Once open, remove the black foam stuck onto the back of the outside-facing vents and put everything back together. While you have the foam cushions off, it’s a good time to give them a cleaning (damp cloth).</p>
<h2>Is that it?</h2>
<p>Yes. The actual sound difference is very slight, but it is noticeable. My guess is that the foam is there only to slightly alter the frequency response of the headphones so that the two models have their own “character” and response curve when tested (some web sites actually graph this as part of their reviews, such as <a href="http://www.headphone.com/learning-center/build-a-graph.php">headphone.com</a>). While both headphones sound good, the HD 595’s preserve their more desirable flatter frequency response curve. It’s this flatter frequency response curve that some people are willing to spend the extra money on, and Sennheiser know this. </p>
<p>Quite a few people speculated in my <a href="http://www.head-fi.org/forum/thread/403963/sennheiser-hd555-and-hd595-internal-comparison-shots">Original thread</a> that the more expensive HD595 headphones must also be using a more expensive driver. However, Head-fi member MCC posted the smoking gun; a picture of the original Sennheiser replacement driver labelled “HD 555 / HD 595”. </p>
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cache/2023/8f76362de8331d4dc5d3e0e0a882606e/index.md View File

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title: Sennheiser HD 555 to HD 595 Mod
url: http://mikebeauchamp.com/misc/sennheiser-hd-555-to-hd-595-mod/
hash_url: 8f76362de8331d4dc5d3e0e0a882606e

<p>This page will show you how to turn a $199.95 (Canadian – Suggested Retail) pair of <a href="http://www.sennheiser.ca/live/senn/produit/en/104/160">Sennheiser HD 555</a> headphones into a pair of <a href="http://www.sennheiser.ca/live/senn/produit/en/105/160">Sennheiser HD 595</a>‘s that cost $349.95. And all you need is a screwdriver.</p>
<h2>Intro</h2>
<p>Instead of designing a completely new product to fit a certain price range, large scale manufacturing dictates that it is often cheaper to simply “cripple” an existing high-end product. This way the manufacturer can use existing molds, parts, assembly lines and training, etc. In electronic products, firmware is usually crippled to omit/hide certain features. For example, digital camera companies reserve functions (like RAW output, exposure and white balance bracketing, long exposures, etc.) for their higher priced cameras, even though their cheapest camera has the same capabilities (See the <a href="http://chdk.wikia.com/wiki/CHDK">CHDK project</a> for more info). </p>
<h2>Comparing HD555 to HD595</h2>
<p>Thanks to the people at <a href="http://www.head-fi.org">head-fi.org</a>, I was able to find someone willing to take apart their expensive HD595 headphones so I could compare them to my moderately priced HD 555 headphones. Here are the photos:</p>
<h2>What are the differences?</h2>
<p>Aside from the aesthetic differences, the only physical difference was an additional piece of foam inside the cheaper HD555 headphones, blocking about 50% of the outside-facing vents. Since both the HD 555 and HD 595 are designed to be “open” headphones, reducing the vent with this foam would alter the frequency response slightly. <strong>So to save yourself $150, open your HD 555’s up and remove the foam. </strong> Done.</p>
<h2>How to do the mod</h2>
<p>The foam cushions are removed simply by pulling on them. From there, use a screwdriver to remove the driver assembly. Once open, remove the black foam stuck onto the back of the outside-facing vents and put everything back together. While you have the foam cushions off, it’s a good time to give them a cleaning (damp cloth).</p>
<h2>Is that it?</h2>
<p>Yes. The actual sound difference is very slight, but it is noticeable. My guess is that the foam is there only to slightly alter the frequency response of the headphones so that the two models have their own “character” and response curve when tested (some web sites actually graph this as part of their reviews, such as <a href="http://www.headphone.com/learning-center/build-a-graph.php">headphone.com</a>). While both headphones sound good, the HD 595’s preserve their more desirable flatter frequency response curve. It’s this flatter frequency response curve that some people are willing to spend the extra money on, and Sennheiser know this. </p>
<p>Quite a few people speculated in my <a href="http://www.head-fi.org/forum/thread/403963/sennheiser-hd555-and-hd595-internal-comparison-shots">Original thread</a> that the more expensive HD595 headphones must also be using a more expensive driver. However, Head-fi member MCC posted the smoking gun; a picture of the original Sennheiser replacement driver labelled “HD 555 / HD 595”. </p>

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@@ -187,6 +189,8 @@
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