we need more metal musician teaching science

thanks for the heart attack at 8:27

the 1/sqrt2 is a 'normalization' meaning that the probability of finding the electron in any state at all must be one. So that factor is there because otherwise you'd have a 200% chance of finding an electron in any state at all. The +/- signs he discusses are associated with having electrons in the same phase or opposite phase - the best analogy is the double pendulum.

One step closer to understanding quantum mechanics. Seven billion more steps to go. :-)

This is great, brilliant in fact. I just have one question... what?

This guy is sooooooo good but that doesn't keep my brains from blowing up into pieces and splattering everywhere in my dorm after the pendulum energy model.

Uhm, yeah. Could you repeat the part where you said the things about the stuff?

The most clear, concise, and understandable explanation of spin I've heard. I wish I had this guy as my quantum mechanics professor 25 years ago.

The pendulum thing blew my mind. I guess it's clearer to me when you transpose it to the more intuitive newtonian mechanics.

Unfortunately, the act of talking about or lecturing on quantum mechanics changes the description of quantum mechanics. Which is why it's so hard to understand.

This blew my mind. And at the end it blew my eardrums

I will subscribe to see more of this guy, he was amazingly precise and interesting

yes, please get rid of loud sound at 8:27 Veritasium for future videos. Great video, but people listen with headphones...

4:30 I love his face here, like "Pretty badass, right?"

The best teachers don't make their students feel like they're being talked down to, regardless of how basic or advanced their subject matter might be, and Professor Morello's definitely that kind of teacher.

haha, ok, point taken. I think the trouble may be the rest of the interview is too quiet but I'll try to get the balance right.

0:59 When I hear "purely quantum mechanical" I associate "Noone knows what it is, but that's just the way it is... accept it"

4:30 - 4:38 I love that little "k?" at the end of the explanation, as if what he said wasn't super counter-intuitive.

we need more of this person. the accent, the articulation in layman, its on point.

I could listen to this Prof. Morello all day. His clear and concise explanations are almost mesmerizing. Thankfully the pause button allows ample time to process everything he says. Really is an incredible video. Thank You for this!

Can't say it enough: Absolutely amazing.. So clear.. Prof. Morello's ability to take a subject so non-intuitive and making everyone somewhat understand the laying foundations of it, is a true gift IMO... Great presentation, more of him, PLEASE! :)

This guy is AMAZING to listen listen to. The way he explains things is just delicious.

I still have barely any idea what he’s saying...but I could listen to him all day. Actually entertaining as a teacher

Andrea Morello is one of the best lecturers I've ever heard. His desire to communicate and ability to articulate complex concepts really create the perfect instructor.

Wow. What a great teacher. This is the first time I understand spin. For some definition of understand ;-) He clearly loves what he does and loves sharing the knowledge. Thanks Professor.

I'm amazed and inspired that you managed to explain spin so clearly in 8mins

Professor Morello injected this knowledge into my brain in such a smooth way, I hardly realized I was actually understanding. Seriously awesome!

This is the best laymans explanation of quantum spin I've heard, and I've heard many. I finally can grasp it. Thanks!

Got confused pretty quickly.... But he explains this things better than anyone else I've heard. Post more videos with him please !

A really good explaination for a really controintuitive subject! Excellent work!!

Fantastic work on your videos Derek, and Prof. Morello is really fascinating ! I love that you (among others like sixty simbols) keep delivering us videos on these kind of topics, keep it up !

Veritasium... Never ever cut/edit the videos when interviewing this Doctor. Thanks for your Videos. Best channel ever.

I love that pendulum experiment! That's so cool!

That heavy thick accent, awesome

What an extraordinary teacher Professor Morello is, every clip you posted with this guy just compels me to keep looking. Brilliant!

This is the best intuitive description of spin I've ever heard. Thank you! Please produce more videos on this subject and quantum computing :)

Quantum computers gives you the answer to life, universe and everything, but only when your not observing it :D

The explanation with the pendulum was excellent

Professor Andrea Morello gives the best intuitive explanations of phenomena that I've seen. His video for Veritasium on quantum computing is equally unrivaled; in but a few minutes, he makes understanding why quantum computing is so powerful---in a way that hours worth of other documentaries fail to do.

What a great explanation! The dual pendulum analogy was magnificent

So we're jus going to ignore that perfect circle he drew...yea sure

My left ear enjoyed that scientists accent

Good job. Some of the stuff you guys go over is way over my head, but I love it. Thank you.

Andrea Morello is from now on my hero! I could listen hours and hours to him. He's so precise, correct and insight giving. Here is a man who understands these topics so well and can explain it so good, that he is clearly above the material. Please more of him!!!

I can tell he knows quantum mechanics very well because I still have no idea what the hell QM spin is. (inside joke between me and Mr. Feynman)

Normal Person : What is a quantum spin? Physicist : Slaps him hard on the face Normal Person : What ?! why !? My head is now spinning Physicist : Can you now explain what you mean by your head spinning ? Normal person : I now understood completely. Thank you !

I paid over £1k to learn about quantum mechanics yet this 8min free vid has made me understand spin so much better

Love these videos Derek, good job!

What is Spin ? I think the answer is phase shift (= shift in coordinate). 1. I think the de Broglie waves of multiple particles in one quantum state are connected in series, and the each wave shift msλ at the connecting point. (ms:spin quantum number, λ:wave length)Let us consider a case in which two electrons are in one quantum state [n,l,ml,ms=+1/2]. The de Broglie wave of 1st electron shifts +λ/2 in coordinate. And the de Broglie wave of 2nd electron shifts +λ/2+λ/2 in coordinate. Accordingly the two waves destructively interfere. [the Pauli exclusion principle] 2. Suppose that two electrons are moving in a single orbit, and suppose that the de Broglie wave of one electron shifts +λ/2 in coordinate and the de Broglie wave of another electron shifts -λ/2 in coordinate. The two waves have the shift of exactly one wavelength, which leads to a constructive interference of the wave, making it possible for the two particles to move in the same orbit. [the 4th quantum number] 3. The variable of wave function Φ{φez･(r ×p)} in φ direction has angular momentum r ×p. Accordingly, the shift in coordinate msλ change the angular momentum as follows: ml(h/2π)→ ml(h/2π)+ms(h/2π). I'm sorry that I'm not good at English.

This video is great, really appreciate your work!

I very much enjoy professor morello. His explanations are fantastic, and being interested in mechanical engineering and quantum mechanical processes, I enjoy his discussions. I'd love to hear more from him. Thanks!

Thanks for the double pendulum demonstration. I really wanted to show that my PHYS 201 class when I discussed sound beats and the general usefulness of the harmonic oscillator. Now I have a video version I can show without having to ask for equipment.

Dracula does physics.

I'm going to have to make a double pendulum.

I've seriously struggled with understanding quantum superposition before now. That double pendulum analogy really made me get it. Thumbs up!

Would love to see more vids with him, he explains things in a very good way!

I liked how you use Newtonian to show quantum works. Thanks

I just keep rewinding 2:03 - 2:05 because he's like a cat, and something just caught his eye and he lost his attention. Or maybe he heard someone talking shit either one lol

whoa! That pendulum analogy was very enlightening, a great way to visualize superposition.

Prof Morello for president ! This is the best channel ever ! Thank you

So then if the particles where spinning in opposing directions and constantly changed directions, what sorts of things could come of such an unnatural state could it be a type of perpetual motion that produces energy?

Tommy Wiseau?! Is that you?!

I really think that this video is a good one! Especially because it tries to give a way to understand (or interpret) the spins. Also, this channel is becoming my favourite over Ve1, just because the acedemic level is higher. More quantum mechanics!

I have been trying to make sense of the superposition for sooo long, and that pendulum explanation just made it all clear, thank you so much!

Spin is not the magnetic field of the electron or other particles. Spin is an intrinsic property of elementary particles. The magnetic spin moment is determined by the spin of the particle and it tells us how the particle will behave when introduced to a magnetic field... A neutron has spin because it is a hadron. Hadrons are composite particles made up of elementary particles. Neutrons are made of quarks which in turn have their own spins. This is where the neutron, and analogously the proton, gets its spin from.

Holy shit! 6:49! Yin & Yang! Ancient Aliens confirmed!

I love the pendulum demo. It's such a cleaver way to present this abstract quantum mechanical concepts to visual learners. Super! :)

Awesome! I love these videos getting deep into what's more interesting. Sometimes it feels like the videos (in general, scientific divulgation videos) should get more information about the topics exposed. Thank you for this video.

he has a charm...😍

But why are the two spins coupled two each other? I mean they are electrons from different phosphor atoms, right? Could somebody please explain me that.

I really enjoy listening to Professor Morello. The double pendulum was a really useful analogy!

The only thing better than listening to Professor Morello? Listening to two Professor Morellos at the same time.

i find his explanations pretty easy to get

Scared me at the end

I'm so glad i found this video. To all youtube video I found this one really made me understand something about spin.

Thanks for these videos, they're great! Most other videos on this give you a very basic answer, not really answering anything. It's nice to be explained it more in terms of the actual maths, as even though you don't understand every single bit of it straight away, the big picture makes a lot more sense.

I had to comment because the video was at 666 comments

Does he have a Hungarian accent?

Professor Morello is so awesome!! More videos with him, please

I love Professor Morello, he explains topics so well.

Can I take quantum mechanics with him instead of with my professor? xD

I see said the blind man

He is such an incredibly good teacher. Wish we had more people like him.

Double-pendulum = entangled state. Great analogy. Prof. Morello explains stuff better than any teacher I've ever had. I love this!

I like listening to Russian accent 😂 xD; D

Fantastic. I loved the double pendulum superposition analogy.

This is actually very nicely explained. I'd love to hear a lecture of his some time.

I love this dude. He is so good at making analogies and helping you understand

Thank you so much for this video. Professor Morello is an inspiration. I would love to study under him.

Excellent analogies and explanations for general public. Wish I had had a physics prof like him in college. I hope we see more lectures for the general public from Prof. Morello.

Wow the pendulum example helped me a lot with intuition! Thanks so much!

Cool stuff, it shows some real skill to make something so hard to graps easier to understand.

I had to watch this at 5 second intervals about 5 times (while taking notes) just to understand this well. Great video, Very Informative if you can actually understand whats going on

Amazing guy to listen to! And holy shit that pendulum analogy made it fascinating. Thank you very much for uploading these, keep 'em coming!

This guy is awesome. I love watching videos with him in them

We need more of these videos!

I'm always wanted to know what exactly the spin was really about... now I know, and actually understand! This guy is sooooo great at explaining things, it's unbelievable!

This was very helpful, well done! Thank you.

Love physics, never ceases to amaze me! Great video :)

Great explanation, Mr. Nugent.