Edit second chapter's into

docs/2-hear.html

@@ -189,10 +189,11 @@ <h2 id="human-senses"><a class="header" href="#human-senses">Human senses</a></h
 <tr><td>Touch</td><td>Skin</td><td>Position/Motion/Temperature</td><td>Touch/Hit</td></tr>
 </tbody></table>
 </div>
-<p>Human brains need to communicate with each other in order to maximize their evolutionary goals, but they are not directly wired to each other (Imagine they were actually connected to each other directly through wires, an interesting question would be, would they then become a single person?) So what is the solution? How can a conscious piece of meat trapped inside a hard skull communicate with other brains? Pretty much like regular computers you have in your home, brains do also have external auxillary hardware connected to them. Eyes, ears, nose, tongue and skin are examples of devices that are connected to the brain to allow it to sense effects of the external world.</p>
-<p>After all, our brain's language is the flow of electricity inside denderites and axons. Before reading the answer, let's imagine we are The Creator and we are going to design a communication system for our creatures to transfer data t</p>
-<p>In this chapter I would like to talk about one of the pleasurable inventions of human beings, music. You hear it everyday, whether as an artistic piece to please your ears, or the sound you hear from your phone when you press a key. I believe composing and playing sounds is one of the most important applications of a computer, which is very underrated topic in computer science. Musical notes are lego pieces of our mind. Putting the right notes in the right order can manipulate a mind, bringing sadness, happiness, excitement, horror, magic and all kinds of emotions in a human brain. The good news is, sound waves, which are the most primitive components of music, can be easily generated a computer, because there are ways to convert electrical causes to mechanical effects. Guess what kind of effect a computer is good at generating it? With the current technology, it’s not trivial to generate “smell” effects. We will go through the history of sound and we will try to understand it by breaking a music to its most primitive parts, and in the end of this chapter, we will be able to make your hear a symphony of beethoven by writing a program that outputs nothing but numbers.</p>
-<p>Understanding music will make you a better programmer, because music itself is all about playing with lego pieces, which is what we programmers basically do everyday.</p>
+<p>Human brains need to communicate with each other in order to maximize their evolutionary goals, but they are not directly wired to each other (Imagine they were actually connected to each other directly through wires, an interesting question would be, would they then become a single brain? a single &quot;person&quot;?) So what is the solution? How can a conscious piece of meat trapped inside a hard skull communicate with other brains? Pretty much like regular computers you have in your home, brains do also have external auxillary hardware connected to them. Eyes, ears, nose, tongue and skin are examples of devices that are connected to the brain to allow it to sense effects of the external world. There are also organs connected to a brain allowing it to generate different kind of outputs/effects in the world, some examples are: generating a sound, giving a smile, even our body can make attractive smells for mating!</p>
+<p>Brain's internal language is the flow of electricity inside denderites and axons. Brain parts can talk with each other through electricity, but for a brain to connect to the external world and send data to another brain, some cause-and-effect conversions are needed. Messages need to be converted into some other form of effect that can be propagated in the environment, and get converted back to electricity again, when reaching the target brain. Imagine you are going to design a communication system for human-like creatures, allowing them to transfer data through the environment they live in. How would you design it?</p>
+<p>This chapter is all about one of the pleasurable inventions of human beings, music, and how it inspired the building blocks of our modern communication systems. You hear it everyday, whether as an artistic piece to please your ears, or the sound you hear from your phone when you press a key. I believe composing and playing sounds is one of the most interesting applications of a computer, which is very underrated topic in computer science. Musical notes are lego pieces of our mind. Putting the right notes in the right order can manipulate a mind, bringing sadness, happiness, excitement, horror, magic and all kinds of emotions in a human brain. The good news is, sound waves, which are the primitive components of musical piece, can be easily generated by a computer, because there are ways to convert electrical causes to mechanical effects. Guess what kind of effect a computer is good at generating it? (Not all human-senses can be easily stimulated by a computer, e.g. sense of smell/taste. With our current technology, it’s not trivial to generate “smell” effects)</p>
+<p>In this chapter, we will go through the history of sound and we will try to understand it by breaking sounds to their most primitive parts. We will see how you can compose a symphony of beethoven by writing a program that outputs nothing but numbers. We will understand that not only humans, but also computers can selectively detect particular primitive sounds within a more complicated sound, and we exploit these facts to design medium for computers to communicate with each other!</p>
+<p>Understanding music is a fun way to start studying sounds. It will also make you a better programmer too, because music itself is all about playing with lego pieces, which is what we programmers basically do everyday.</p>
 <h2 id="history-of-vibration"><a class="header" href="#history-of-vibration">History of vibration</a></h2>
 <p>Thomas Alva Edison, some people think of him as a bad guy who stole Tesla’s ideas. We are not here to judge, anyways, he was an inventor and made inventions through his life that had big impacts in our history and were inspiring many people. Here I want to talk about one of his inventions which I myself find very primitive and impressive, the Phonograph (Nowadays we call them Gramophone too) (1877).</p>
 <p>Phonographs, as defined in Wikipedia, are devices that can record and reproduce music. The idea behind it is both very smart and simple. Imagine a needle on a rotating disk, where the needle is connected to something like a loudspeaker, which vibrates when someones speaks near it. The needle drills holes on the disk when it vibrates. As the disk rotates, there will be different holes with different depths over time, effectively recording the intensity of air pressure over time.</p>

docs/print.html

@@ -1452,10 +1452,11 @@ <h2 id="human-senses"><a class="header" href="#human-senses">Human senses</a></h
 <tr><td>Touch</td><td>Skin</td><td>Position/Motion/Temperature</td><td>Touch/Hit</td></tr>
 </tbody></table>
 </div>
-<p>Human brains need to communicate with each other in order to maximize their evolutionary goals, but they are not directly wired to each other (Imagine they were actually connected to each other directly through wires, an interesting question would be, would they then become a single person?) So what is the solution? How can a conscious piece of meat trapped inside a hard skull communicate with other brains? Pretty much like regular computers you have in your home, brains do also have external auxillary hardware connected to them. Eyes, ears, nose, tongue and skin are examples of devices that are connected to the brain to allow it to sense effects of the external world.</p>
-<p>After all, our brain's language is the flow of electricity inside denderites and axons. Before reading the answer, let's imagine we are The Creator and we are going to design a communication system for our creatures to transfer data t</p>
-<p>In this chapter I would like to talk about one of the pleasurable inventions of human beings, music. You hear it everyday, whether as an artistic piece to please your ears, or the sound you hear from your phone when you press a key. I believe composing and playing sounds is one of the most important applications of a computer, which is very underrated topic in computer science. Musical notes are lego pieces of our mind. Putting the right notes in the right order can manipulate a mind, bringing sadness, happiness, excitement, horror, magic and all kinds of emotions in a human brain. The good news is, sound waves, which are the most primitive components of music, can be easily generated a computer, because there are ways to convert electrical causes to mechanical effects. Guess what kind of effect a computer is good at generating it? With the current technology, it’s not trivial to generate “smell” effects. We will go through the history of sound and we will try to understand it by breaking a music to its most primitive parts, and in the end of this chapter, we will be able to make your hear a symphony of beethoven by writing a program that outputs nothing but numbers.</p>
-<p>Understanding music will make you a better programmer, because music itself is all about playing with lego pieces, which is what we programmers basically do everyday.</p>
+<p>Human brains need to communicate with each other in order to maximize their evolutionary goals, but they are not directly wired to each other (Imagine they were actually connected to each other directly through wires, an interesting question would be, would they then become a single brain? a single &quot;person&quot;?) So what is the solution? How can a conscious piece of meat trapped inside a hard skull communicate with other brains? Pretty much like regular computers you have in your home, brains do also have external auxillary hardware connected to them. Eyes, ears, nose, tongue and skin are examples of devices that are connected to the brain to allow it to sense effects of the external world. There are also organs connected to a brain allowing it to generate different kind of outputs/effects in the world, some examples are: generating a sound, giving a smile, even our body can make attractive smells for mating!</p>
+<p>Brain's internal language is the flow of electricity inside denderites and axons. Brain parts can talk with each other through electricity, but for a brain to connect to the external world and send data to another brain, some cause-and-effect conversions are needed. Messages need to be converted into some other form of effect that can be propagated in the environment, and get converted back to electricity again, when reaching the target brain. Imagine you are going to design a communication system for human-like creatures, allowing them to transfer data through the environment they live in. How would you design it?</p>
+<p>This chapter is all about one of the pleasurable inventions of human beings, music, and how it inspired the building blocks of our modern communication systems. You hear it everyday, whether as an artistic piece to please your ears, or the sound you hear from your phone when you press a key. I believe composing and playing sounds is one of the most interesting applications of a computer, which is very underrated topic in computer science. Musical notes are lego pieces of our mind. Putting the right notes in the right order can manipulate a mind, bringing sadness, happiness, excitement, horror, magic and all kinds of emotions in a human brain. The good news is, sound waves, which are the primitive components of musical piece, can be easily generated by a computer, because there are ways to convert electrical causes to mechanical effects. Guess what kind of effect a computer is good at generating it? (Not all human-senses can be easily stimulated by a computer, e.g. sense of smell/taste. With our current technology, it’s not trivial to generate “smell” effects)</p>
+<p>In this chapter, we will go through the history of sound and we will try to understand it by breaking sounds to their most primitive parts. We will see how you can compose a symphony of beethoven by writing a program that outputs nothing but numbers. We will understand that not only humans, but also computers can selectively detect particular primitive sounds within a more complicated sound, and we exploit these facts to design medium for computers to communicate with each other!</p>
+<p>Understanding music is a fun way to start studying sounds. It will also make you a better programmer too, because music itself is all about playing with lego pieces, which is what we programmers basically do everyday.</p>
 <h2 id="history-of-vibration"><a class="header" href="#history-of-vibration">History of vibration</a></h2>
 <p>Thomas Alva Edison, some people think of him as a bad guy who stole Tesla’s ideas. We are not here to judge, anyways, he was an inventor and made inventions through his life that had big impacts in our history and were inspiring many people. Here I want to talk about one of his inventions which I myself find very primitive and impressive, the Phonograph (Nowadays we call them Gramophone too) (1877).</p>
 <p>Phonographs, as defined in Wikipedia, are devices that can record and reproduce music. The idea behind it is both very smart and simple. Imagine a needle on a rotating disk, where the needle is connected to something like a loudspeaker, which vibrates when someones speaks near it. The needle drills holes on the disk when it vibrates. As the disk rotates, there will be different holes with different depths over time, effectively recording the intensity of air pressure over time.</p>

src/2-hear.md

@@ -18,13 +18,15 @@ There are 6 different kinds of ways a human brain can make sense of the external
 | Taste   | Tongue     | Chemical substances         | ?!            |
 | Touch   | Skin       | Position/Motion/Temperature | Touch/Hit     |
 
-Human brains need to communicate with each other in order to maximize their evolutionary goals, but they are not directly wired to each other (Imagine they were actually connected to each other directly through wires, an interesting question would be, would they then become a single person?) So what is the solution? How can a conscious piece of meat trapped inside a hard skull communicate with other brains? Pretty much like regular computers you have in your home, brains do also have external auxillary hardware connected to them. Eyes, ears, nose, tongue and skin are examples of devices that are connected to the brain to allow it to sense effects of the external world.
+Human brains need to communicate with each other in order to maximize their evolutionary goals, but they are not directly wired to each other (Imagine they were actually connected to each other directly through wires, an interesting question would be, would they then become a single brain? a single "person"?) So what is the solution? How can a conscious piece of meat trapped inside a hard skull communicate with other brains? Pretty much like regular computers you have in your home, brains do also have external auxillary hardware connected to them. Eyes, ears, nose, tongue and skin are examples of devices that are connected to the brain to allow it to sense effects of the external world. There are also organs connected to a brain allowing it to generate different kind of outputs/effects in the world, some examples are: generating a sound, giving a smile, even our body can make attractive smells for mating!
 
-After all, our brain's language is the flow of electricity inside denderites and axons. Before reading the answer, let's imagine we are The Creator and we are going to design a communication system for our creatures to transfer data t
+Brain's internal language is the flow of electricity inside denderites and axons. Brain parts can talk with each other through electricity, but for a brain to connect to the external world and send data to another brain, some cause-and-effect conversions are needed. Messages need to be converted into some other form of effect that can be propagated in the environment, and get converted back to electricity again, when reaching the target brain. Imagine you are going to design a communication system for human-like creatures, allowing them to transfer data through the environment they live in. How would you design it?
 
-In this chapter I would like to talk about one of the pleasurable inventions of human beings, music. You hear it everyday, whether as an artistic piece to please your ears, or the sound you hear from your phone when you press a key. I believe composing and playing sounds is one of the most important applications of a computer, which is very underrated topic in computer science. Musical notes are lego pieces of our mind. Putting the right notes in the right order can manipulate a mind, bringing sadness, happiness, excitement, horror, magic and all kinds of emotions in a human brain. The good news is, sound waves, which are the most primitive components of music, can be easily generated a computer, because there are ways to convert electrical causes to mechanical effects. Guess what kind of effect a computer is good at generating it? With the current technology, it’s not trivial to generate “smell” effects. We will go through the history of sound and we will try to understand it by breaking a music to its most primitive parts, and in the end of this chapter, we will be able to make your hear a symphony of beethoven by writing a program that outputs nothing but numbers.
+This chapter is all about one of the pleasurable inventions of human beings, music, and how it inspired the building blocks of our modern communication systems. You hear it everyday, whether as an artistic piece to please your ears, or the sound you hear from your phone when you press a key. I believe composing and playing sounds is one of the most interesting applications of a computer, which is very underrated topic in computer science. Musical notes are lego pieces of our mind. Putting the right notes in the right order can manipulate a mind, bringing sadness, happiness, excitement, horror, magic and all kinds of emotions in a human brain. The good news is, sound waves, which are the primitive components of musical piece, can be easily generated by a computer, because there are ways to convert electrical causes to mechanical effects. Guess what kind of effect a computer is good at generating it? (Not all human-senses can be easily stimulated by a computer, e.g. sense of smell/taste. With our current technology, it’s not trivial to generate “smell” effects)
 
-Understanding music will make you a better programmer, because music itself is all about playing with lego pieces, which is what we programmers basically do everyday.
+In this chapter, we will go through the history of sound and we will try to understand it by breaking sounds to their most primitive parts. We will see how you can compose a symphony of beethoven by writing a program that outputs nothing but numbers. We will understand that not only humans, but also computers can selectively detect particular primitive sounds within a more complicated sound, and we exploit these facts to design medium for computers to communicate with each other!
+
+Understanding music is a fun way to start studying sounds. It will also make you a better programmer too, because music itself is all about playing with lego pieces, which is what we programmers basically do everyday.
 
 ## History of vibration