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📘 How does modern technology actually work?

You tap a maps app. A street you have never photographed fills the screen. Nothing in your hand knows that street. The phone is a stack: switches on a chip, instructions in memory, packets on a radio, and a computer that is not in the room

5
lessons
~25 min
to learn
Adults
level
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What you’ll learn

  1. The tap is a stackTreat one tap as five machines in sequence — switch, instruction, software, packet, distant computer — and refuse the idea that the phone is the whole system.A maps tap paints a street that is not stored as a photograph in your pocket. OpenStax's web-request path is the same stack: a local machine asks a bigger one, then paints what comes back.
  2. Switches on a chipRead a MOSFET as a voltage-controlled switch, put about 2,300 of them on the 4004 advertised in November 1971, and contrast that with billions on a modern chip without inventing a phone-model count.MIT 6.004: gate voltage opens or closes a path. IEEE Spectrum and CHM: 4004 had 2,300 transistors. Intel's 2021 comparison: billions on a current Core. The switch did not become a mind.
  3. Instructions, not understandingWalk OpenStax's fetch-decode-execute loop, split the operating system from the app, and state that a map is painted bits, not a chip that knows streets.The CPU fetches 1s and 0s, decodes them, and the ALU executes. The OS loads the executable. English never enters the chip.
  4. Packets leave the pocketDescribe IPv4 as addressed datagrams (RFC 791), put DNS in front as a resolver talking to name servers (RFC 1034), and treat the radio as a first hop, not the internet.Datagrams travel by fixed-length address. TTL is a hop budget. A name is not a route until a resolver fetches an address.
  5. The other computerPlace the answer in a data center using IEA's 2024 electricity census, then read the blue dot as a four-satellite GPS fix from GPS.gov, and send the reader to name a layer tonight.415 TWh, about 1.5% of world electricity in 2024; 945 TWh is a 2030 projection. GPS: 24 operational 95% of the time, usually about 31 flying, four in view for a fix.

Questions this course answers

What did Intel put on the 4004, and when did it advertise the chip as a product you could buy?

IEEE Spectrum and the Computer History Museum both put about 2,300 transistors on the 4004. Intel advertised it in Electronic News on 15 November 1971. Billions is the modern comparison, not 1971.

Match each layer of a tap to its job.

The phone is a client in a stack. Switches change state. Packets carry addressed lumps. The map and often the blue dot come from machines that are not in your pocket.

Order the hardware loop OpenStax describes for one instruction.

OpenStax §5.1: fetch into a register, decode, ALU executes, result to a register or memory, then the next fetch. The phone is running that loop, not reading English.

In RFC 791, what does the Internet Protocol transmit, and how are the ends named?

RFC 791: IP transmits blocks of data called datagrams from sources to destinations, and those hosts are identified by fixed-length addresses. DNS (RFC 1034) is how a name becomes an address before that datagram can leave.

Which pair is what the IEA reported for data centers in 2024, and what GPS.gov says the United States commits to in orbit?

IEA Energy and AI: 415 TWh, about 1.5% of world electricity in 2024. 945 TWh is the 2030 base-case projection, not a 2024 measurement. GPS.gov: at least 24 operational satellites 95% of the time; the Space Force has been flying about 31 to keep that promise. Four visible satellites are what the 24-slot design is for.

Grounded in trusted sources

  • IEEE Spectrum, Chip Hall of Fame: Intel 4004 Microprocessor (Stephen Cass, 2 July 2018; updated 15 March 2024). World's first commercial microprocessor on a single chip; 2,300 transistors; advertised November 1971 after Busicom MCS-4 work. https://spectrum.ieee.org/chip-hall-of-fame-intel-4004-microprocessor
  • Computer History Museum, Silicon Engine: Microprocessor Integrates CPU Function onto a Single Chip. Ted Hoff and Stanley Mazor conceived the 4004; in 1971 Federico Faggin, assisted by Masatoshi Shima, squeezed 2,300 transistors into a 16-pin package. Die 12 sq mm, 10 micron minimum line, 2-inch p-channel silicon-gate MOS wafers. https://www.computerhistory.org/siliconengine/microprocessor-integrates-cpu-function-onto-a-single-chip/
  • Intel, Celebrating the 50th Anniversary of the Intel 4004 (newsroom infographic, 2021). Launched 15 November 1971; 2,300 transistors; 10 µm; contrast with 12th-generation Core family listed as billions of transistors. https://download.intel.com/newsroom/2021/data-center/4004-infographic.pdf
  • OpenStax, Introduction to Computer Science, §5.1 Computer Systems Organization (via Engineering LibreTexts). Hardware fetches an instruction from memory into the CPU, decodes the 1s and 0s, ALU executes, result to a register or memory; OS loads the executable; IP address as the number a website request uses. https://eng.libretexts.org/Bookshelves/Computer_Science/Programming_and_Computation_Fundamentals/Introduction_to_Computer_Science_(OpenStax)/05%3A_Hardware_Realizations_of_Algorithms-_Computer_Systems_Design/5.01%3A_Computer_Systems_Organization
  • MIT OpenCourseWare, 6.004 Computation Structures (Spring 2017), MOSFET as digital switch: when V_GS is below threshold the NFET is off; above threshold it conducts; CMOS inverter is one NFET pulldown and one PFET pullup. https://ocw.mit.edu/courses/6-004-computation-structures-spring-2017/
  • IETF RFC 791, Internet Protocol, DARPA Internet Program Protocol Specification (Jon Postel, September 1981). IP transmits datagrams from sources to destinations identified by fixed-length addresses; routing; internet modules in hosts and gateways; IPv4 header includes 32-bit addresses and 8-bit Time to Live. https://www.rfc-editor.org/rfc/rfc791
  • IETF RFC 1034, Domain Names — Concepts and Facilities (P. Mockapetris, November 1987). Name servers are authoritative for zones; resolvers extract information from name servers in response to client requests. https://www.rfc-editor.org/rfc/rfc1034
  • GPS.gov, Space Segment. U.S. commitment: at least 24 operational GPS satellites 95% of the time; Space Force flying 31 operational satellites for well over a decade; MEO ~20,200 km; each satellite circles Earth twice a day; six planes, four baseline slots; at least four satellites visible from virtually any point. https://www.gps.gov/space-segment

Every Wunder lesson is built from real, reputable sources — never invented.

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