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It is quite cool that photosynthesis works just like cellular respiration by producing a proton potential through chemiosmosis.
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Quantum entanglement Updated 2025-07-16
Quantum entanglement is often called spooky/surprising/unintuitive, but they key question is to understand why.
To understand that, you have to understand why it is fundamentally impossible for the entangled particle pair be in a predefined state according to experiments done e.g. where one is deterministically yes and the other deterministically down.
In other words, why local hidden-variable theory is not valid.
How to generate entangled particles:
- particle decay, notably pair production
- for photons, notably: spontaneous parametric down-conversion, e.g.: www.youtube.com/watch?v=tn1sEaw1K2k "Shanni Prutchi Construction of an Entangled Photon Source" by HACKADAY (2015). Estimatd price: 5000 USD.
Contains the clearest Bell test experiment description seen so far.
It clearly describes the photon-based 22.5, 45 degree/85%/15% probability photon polarization experiment and its result conceptually.
It does not mention spontaneous parametric down-conversion but that's what they likely hint at.
Done in Collaboration with 3Blue1Brown.
Question asking further clarification on why the 100/85/50 thing is surprising: physics.stackexchange.com/questions/357039/why-is-the-quantum-venn-diagram-paradox-considered-a-paradox/597982#597982
Quantum Mechanics: Animation explaining quantum physics by Physics Videos by Eugene Khutoryansky (2013)
Source. Usual Eugene, good animations, and not too precise explanations :-) youtu.be/iVpXrbZ4bnU?t=922 describes a conceptual spin entangled electron-positron pair production Stern-Gerlach experiment as a Bell test experiments. The 85% is mentioned, but not explained at all.
Quantum Entanglement Lab by Scientific American (2013)
Source. The hosts interview Professor Enrique Galvez of Colgate University who shows briefly the optical table setup without great details, and then moves to a whiteboard explanation. Treats the audience as stupid, doesn't say the keywords spontaneous parametric down-conversion and Bell's theorem which they clearly allude to. You can even them showing a two second footage of the professor explaining the rotation experiments and the data for it, but that's all you get. Yakuake Updated 2025-07-16
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Bibliography:
- Something Ventured (2011) documentary
Tower defense Updated 2025-07-16
Ciro Santilli really likes this genre.
Nerds 2.0.1 Updated 2025-07-16
Very very good. Those nice pre-Dot-com bubble vibes.
Might be freely watchable? Wikipedia links to:
But they do start with an FBI warning about copyright. So... erm.
Part 1 - Networking The Nerds talks about the TCP/IP and early machines implementing it:
- 21:00: shows inside The Pentagon. The way the dude who works there opens a his locked office door with an electric switch is just amazing. Cringely also mentions that there's an actual official speed limit in the corridors as he rides a carrier bike slowly through them.
- 21:45: the universities weren't enthusiastic, because people from other locations would be able to use your precious computer time. But finally ARPA forced the universities' hands, and they joined.
- 24:24 mentions that some of the guys who created ARPANET were actually previously counting cards at Casinos in Las Vegas, just like in the 21 (2008) film
- one of the centerpieces of development was at UCLA. The other was the BBN company. 33:55 shows the first router, then called them Interface Message Processor
- the first message was from UCLA to Stanford University. He was trying to write "Login", and it crashed at the 'g'. Epic. They later debugged it.
- towards the end talks about ALOHAnet, the first wireless computer communication done
Part 2 - Serving the Suits
- Robert Metcalfe. He's nice. Xerox PARC. Ethernet.
- Explains what is a "Workstation", notably showing one by Sun Microsystems. This is now an obscure "passé" thing in 2020 that young people like Ciro Santilli have only heard of in legend (or in outdated university computer labs!). Funny to think that so many people have had this idea before, including e.g. the Chromebook
- 10:46 mentions that all of Cisco, Silicon Graphics and Sun Microsystems and where founded at Margaret Jacks Hall, Building 460, at Stanford University.
- he then talks a lot about Sun. Sun became dominant in Wall Street.
- 19:05: Novell, from Utah. How they almost went bust, but were saved at the last moment by Ray Noorda, who refocused them to their NetWare product which was under recent development. It allowed file and printer sharing in IBM PCs. 22:55 shows how they had a live radio host for people waiting on customer support calls!
- 33:56 mentions how The Grateful Dead had in impact on the Internet, as people wanted computers to be able to access The WELL online forum. They still own the domain as of 2022: www.well.com/. It is interesting how Larry Page also liked The Grateful Dead as mentioned at The Google Story, his dad would take him to shows. Larry is a bit younger of course than the people in this documentary.
- 37 show McAfee
- 43:56: fantastic portrait of Cisco
Part 3 - Wiring the World:
- Berners-Lee at CERN and the invention of the URL.
- 1992: US Government allow commerce on the Internet
- Web browser history, Mosaic and Marc Andresseeen.
- 20:45: America Online
- 23:29: search engines and Excite. Google was a bit too small to be on his radar!
- 25:50: porn
- 27: The Motley Fool and advertising
- 30: Planet U grocery shopping
- 31:50: Amazon
- 33:00: immigrant workers, Indians playing cricket, outsourcing, Wipro Systems
- 41:25: Java
- 46:30: Microsoft joins the Internet. The Internet Tidal Wave Internet memo. Pearl Harbour day talk.
- 56:40: Excite Tour. If they had survived, they would have been Google with their quirky offices.
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Funding:
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Capital of the Northern Song dynasty. Features in Water Margin.
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