• The Internet: Crash Course Computer Science #29
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    The Internet: Crash Course Computer Science #29

    Hi, I’m Carrie Anne, and welcome to CrashCourse Computer Science! As we talked about last episode, your computer is connected to a large, distributed network, called The Internet. I know this because you’re watching a youtube video, which is being streamed over that very internet. It’s arranged as an ever-enlarging web of interconnected devices. For your computer to get this video, the first connection is to your local area network, or LAN, which might be every device in your house that’s connected to your wifi router. This then connects to a Wide Area Network, or WAN, which is likely to be a router run by your Internet Service Provider, or…

  • Web Search: Crash Course AI #17
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    Web Search: Crash Course AI #17

    Hi, I’m Jabril and welcome to Crash Course AI! There used to be a time when a group of friends at dinner could ask a question like “is a hot dog a sandwich?” and it would turn into a basic shouting match with lots of gesturing and hypothetical examples. But now, we have access to a LOT of human knowledge in the palm of our hands… so our friends can look up memes and dictionary definitions and pictures of sandwiches to prove that none of them have a connected bun like hot dogs (disappointed). Search engines are a huge part of modern life. They help us access information, find directions…

  • The World Wide Web: Crash Course Computer Science #30
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    The World Wide Web: Crash Course Computer Science #30

    Hi, I’m Carrie Anne, and welcome to CrashCourse Computer Science. Over the past two episodes, we’ve delved into the wires, signals, switches, packets, routers and protocols that make up the internet. Today we’re going to move up yet another level of abstraction and talk about the World Wide Web.This is not the same thing as the Internet, even though people often use the two terms interchangeably in everyday language. The World Wide Web runs on top of the internet, in the same way that Skype, Minecraft or Instagram do. The Internet is the underlying plumbing that conveys the data for all these different applications. And The World Wide Web is…

  • Politics: Crash Course Sociology #30
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    Politics: Crash Course Sociology #30

    You’re a good citizen, right? You voted in the last election, or you’re looking forward to voting in the future. You pay your taxes. You’re happy to exercise the full range of your civic responsibilities. The point is, you might already know all about how your government works. If you don’t, and you’re American, well, there’s a Crash Course for that. But even if you’re an informed citizen who knows every line of your constitution by heart, that doesn’t mean you know why your government works. For that, we need a different kind of political knowledge. Civics can tell you how your system works, but sociology can help you understand…

  • The Internet and Computing: Crash Course History of Science #43
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    The Internet and Computing: Crash Course History of Science #43

    We’ve talked a lot about advances in biotech. But none of those could have happened without advances in computing. It’s time to get back to data and explore the unlikely birth, strange life, and potential futures of the Internet. The theme of the history of computing is that what we mean by “computing” keeps changing. With the invention of the transistor in 1947, the computer started to shrink! And speed up! And change meaning yet again, becoming a ubiquitous dimension of contemporary life—not to mention a totally normal thing to yell at. Hey Google… can you roll the intro? [long pause] Google: I’m not sure. [Intro Music Plays] In 1965,…

  • The Singularity, Skynet, and the Future of Computing: Crash Course Computer Science #40
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    The Singularity, Skynet, and the Future of Computing: Crash Course Computer Science #40

    Hi, I’m Carrie Anne, and welcome to Crash Course Computer Science! We’re here: the final episode! If you’ve watched the whole series, hopefully you’ve developed a newfound appreciation for the incredible breadth of computing applications and topics. It’s hard to believe we’ve worked up from mere transistors and logic gates, all the way to computer vision, machine learning, robotics and beyond. We’ve stood on the shoulders of giants like Babbage and Lovelace, Hollerith and Turing, Eckert and Hopper, Sutherland and Engelbart, Bush and Berners Lee, Gates and the Woz, and many other computing pioneers. My biggest hope is that these episodes have inspired you to learn more about how these…

  • Psychology of Computing: Crash Course Computer Science #38
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    Psychology of Computing: Crash Course Computer Science #38

    Hi, I’m Carrie Anne, and welcome to Crash Course Computer Science! So, over the course of this series, we’ve focused almost exclusively on computers – the circuits and algorithms that make them tick. Because…this is Crash Course Computer Science. But ultimately, computers are tools employed by people. And humans are… well… messy. We haven’t been designed by human engineers from the ground up with known performance specifications. We can be logical one moment and irrational the next. Have you ever gotten angry at your navigation system? Surfed wikipedia aimlessly? Begged your internet browser to load faster? Nicknamed your roomba? These behaviors are quintessentially human! To build computer systems that are…

  • Electronic Computing: Crash Course Computer Science #2
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    Electronic Computing: Crash Course Computer Science #2

    Our last episode brought us to the start of the 20th century, where early, special purpose computing devices, like tabulating machines, were a huge boon to governments and business – aiding, and sometimes replacing, rote manual tasks. But the scale of human systems continued to increase at an unprecedented rate. The first half of the 20th century saw the world’s population almost double. World War 1 mobilized 70 million people, and World War 2 involved more than 100 million. Global trade and transit networks became interconnected like never before, and the sophistication of our engineering and scientific endeavors reached new heights – we even started to seriously consider visiting other…

  • Articles

    Early Computing: Crash Course Computer Science #1

    Hello world, I’m Carrie Anne, and welcome to CrashCourse Computer Science! Over the course of this series, we’re going to go from bits, bytes, transistors and logic gates, all the way to Operating Systems, Virtual Reality and Robots! We’re going to cover a lot, but just to clear things up – we ARE NOT going to teach you how to program. Instead, we’re going to explore a range of computing topics as a discipline and a technology. Computers are the lifeblood of today’s world. If they were to suddenly turn off, all at once, the power grid would shut down, cars would crash, planes would fall, water treatment plants would…

  • Immune System, Part 1: Crash Course A&P #45
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    Immune System, Part 1: Crash Course A&P #45

    You may not know it, but your body is engaged in a never-ending battle. You are literally covered in staph and strep and e coli, and all sorts of dubious characters that are intent on using you, and your body’s many resources, to feed themselves, find shelter, and reproduce as much as they want. And, hey, we all gotta make a living. But it is not your job to give these guys a free lunch. So your body has developed a three-part policy toward these shady customers, and its enforcement is handled by your immune system. The immune system is different from all the other systems we’ve talked about this…