the concept of mass

So there's just one mass. Just one.

[kailkay]

Thank you for not mentioning Descartes too early in the video. Most professors and teachers have a habit of (all too often) putting Descartes before the course.

[rakino]

My favourite Newton fun fact is that he wss appointed Warden of the Royal Mint, which was apparently meant to be mostly ceremonial but he took it super seriously and went undercover in bars and taverns to seek out counterfeiting operations, which he then attempted to prosecute.

[peterk]

The best description of getting a degree I've ever heard is "Every year we lie to you a little less."

[howdyfriends]

39:51 i literally commented on one of reviewbrah's videos "wolfgang pauli lookin-ass" back in like 2015 when he was blowing up, i've only been watching your channel for two days but i'm consistently impressed how heavily you're focused on the real issues

[gvasari]

58:42 Sickle Cell Anemia actually does have natural selection pressure to stick around in the gene pool because it confers some resistance to malaria. There is a heterozygote advantage: people with Sickle Cell Trait, who have one "normal" allele and one sickle cell allele, typically do not suffer the devastating effects of sickle cell disease, but do have significantly reduced fatality rates from malaria. Sickle Cell Anemia & Trait are most common in parts of the world with endemic malaria.

[garak]

The "I'm a medical doctor, I took one physics class, I understand relativity" bit made me cry laughing.
As a physicist working in a hospital, I feel seen.

[jaidei]

I appreciate what you are saying here about teaching something wrong as a "teaching technique." I'm a retired Math & Physics teacher. There is nothing more frustrating than trying to "un-teach" something a student mis-learned years ago because it was "easier." I still had students telling me that you can't subtract a bigger number from a smaller number because that was what their elementary teacher taught them 10 years ago. People remember that first leaning episode more strongly than several later correct teachings. To those that teach, please, either teach concepts correctly the first time or just say "you'll learn about that later." I found when leaving it as a mystery to be learned in the future half of the students were curious enough to research it on there own; and those who didn't at least didn't have the wrong idea implanted. As a Physics undergrad I was also taught about rest mass and relativistic mass. That was totally unnecessary.

[ingframin]

You should seriously consider make instructional videos on YouTube. You have a natural ability to keep the audience engaged even when you explain a subject like this.

[mehill]

I’m a research physicist and once was talking with a physics teacher/instructor and he started talking about relativistic mass. Since he taught it a lot and I never thought about it the kids (we were at a cub scout event) nearby probably thought that he understood things better. I was just kind of stuttering saying, “uhh, nobody thinks about mass like that anymore…it’s the old way” and he smoothly stated “no, mass increases with velocity and that’s why the speed of light can’t be reached.” The pyramid thing really helps to explain the situation. Enjoyed the video!

[sovietcranberry]

Tangential to the off topic discussion at 38:45, I love the mention that we did not know how stars worked until relativity. My best friend and I each have half of a series of books called "The Books Of Knowledge" (which is just a great title). It is an encyclopedia published around 1912, but had significant content-altering revisions over time. I believe I have the 1940's edition. Point is, that while perusing the book, I came across a fascinating question in a Q/A section of the book which goes as follows: "When will the sun run out of oxygen, " to which the answer was some flavor of ¯\_(ツ)_/¯. The question implies a belief that the sun is literally just a space bonfire, so there is evidence of the general public wondering about how tf the sun did its shenanigans even significantly after the 1920's.

[KarlFredrik]

You are a born public speaker. I'm very impressed with your presentations. Not many people can structure a talk with such focus and present it in such a relaxed way for 1h+ without ever stuttering.

[OmnipotentNoodle]

7:00 When Descartes talks about "extension, " he means extension into the physical world. Essentially, when something has the property of "extension, " that just means it takes up space. This is especially important to the philosophy of Descartes, as he was a mind-body Dualist. This means he believed our conscious, thinky-thinky bits are a separate thing that exists in a different manner from physical, material stuff, like matter, which has the property of extension.

He also asserts that extension is the ONLY property possessed by matter. When we experience matter through our senses, we can detect smells, and flavors, and how it reflects light, and what it sounds or feels like, but these aspects are only things that we "presuppose [as] extension, " which is to say they are not properties inherent to a "bodily substance" i.e. matter. Essentially, the ONLY property matter possesses is that it takes up space (it is EXTENDED into the material plane), and everything else we perceive about this matter is simply our interpretation of this extension. All attributes that could possibly be ascribed to matter are only ever different expressions of its extension.

Its a philosophy that's still relatively relevant today, surprisingly. If we think about olfactory sensors, for smell isn't a THING. Smells don't exist. Smells are our thinky-thinky bits interfacing with and creating an interpretation of matter through the SHAPE of a molecule (the shape of matter amounts to its extension). Even with sight, we are interfacing not with a REAL sensation, but rather the "shape" of the light (amplitude, frequency, wavelength).

At least that's how I understand it from my philosophy course, please lmk if i got something wrong ^^

anyway its also kinda funny bc Descartes was EXTRAORDINARILY devoutly christian but was constantly playing with ideas that got christians angry at him lmfao. look up "descartes evil demon"

[yeepyorp]

My teachers in HS and basic undergrad chemistry mentioned probability clouds and mentioned that it's pretty complicated so we don't get into them and I learned so much about chemistry and other subjects just from teachers admitting that they're not giving the full background; I was that 3rd grader talking about Bose-Einstein condensate when my teacher talked about 3 states of matter (much to her chagrin) but knowing there was so much more out there really helped me get interested in science; I really hope more educators catch on to this because it made school so much more engaging for me.

[teodorene]

Thank you so much for this video. I never imagined the day would come when I would get representation in the media on this particular topic, and it's definitely validating.

[eucherenkov]

Your videos are amazing. I'm a philosophy student whose biggest disappointment in life is not being a physicist, and these videos are some of the best I've ever watched.

[robertgreen]

You were very kind about Brain Green docs. I watched one of his on String Theory and the only knowledge I gained from it was that strings are little multi-coloured circles that make wind-chime noises and float around your head.

[Huntracony]

I think what some teachers forget is that you can just be honest about lying. You're not lying to conceal the truth, you're lying to make things easier to understand. Just tell them that.

[ModCounter]

"You know what holds the quarks together? Gluons...get it?" 46:10
Perfect delivery, I couldnt help but laugh out loud.
Excellent Video once again, I learned a lot.

[swooper]

My favorite thing about this channel is the way she takes some of the most complex concepts in science, hears "explain like I'm 5", and presents these topics with the kindness and patience a decent person would show to a literal 5 year old, instead of the sneering contempt most of the internet associates with that phrase.

Thanks for explaining these complicated subjects like I'm actually five.

[andrewrush]

As someone who has consumed a lot of popular physics and has concocted a lot of crackpot theories (which I have NOT emailed to physicists and never really thought were true, but just enjoyed coming up with them), it's both exciting and kind of crushing to be shown in such ab entertaining way that you actually have to do the math... with the right formula no less. Thanks for the videos. Subscribed