@tompenny5684

This has to be possibly the most professional and well put together physics channel on Youtube. From the animations to the logical descriptions which make difficult concepts make sense! This has given me so much to write about for my formal report on Black Body radiation. 
Thank you!

@harshitshukla7382

After watching these lectures i really feel science has scratched the surface, there's so much to learn, and thanks to channels like these, we are getting to question again and wonder at the world around us, a trait long lost with childhood!

@ttrestle

I just love how popular this channel is. Many times I don’t understand what’s being talked about but I always watch every vid. Sometimes multiple times.

@KahnSkins

Im a highschool graduate with no schooling in Quantum Physics but I Have a real passion for it and these videos are absolutely fantastic! I was never good at math but I understand the theories very well!! love these videos!

@BoomBrush

That moment at 9:40 was a "lightbulb" moment for me. The explanation is amazing here, well done with the video!

@MaBuSt

I'm a PhD in Materials Science. I also had a phenomenal Materials Properties course as an undergrad. This was still one of the best ways of diagrammatically showing the origins of the UV catastrophe (at 6:43)

@BeCurieUs

There have been a lot of great episodes here, but this one is by far my favorite. I like hearing the history of the math and scientists as much as the science. The story about Plank and him going "huh, try this" was really fun. And I really like the integration of the tortoise analogy with BB radiation and Plank length. Everything just worked for me :D

@Woodmakerstudios

I love watching PBS, it makes me feel more intelligent than I am.

@iainballas

"I'm glad we could help you guys get entangled"
Keeping education Classy. Thanks, that made my day!

@satori92

you are seriously THE BEST, you bring me back to the school desk, when I was discovering such things for the first time, and then reading on books and science magazines, watching   Carl Sagan on the tv... amazing

@n4thanfv

The best channel on YT!! Thanks for another video that enlightens us all on the beauty of the universe!
Q: Is there an independent experimental method to measure the Planck's Constant?
I ask this because for what I understood, they calculated it based on previous measurements, so it was more like a math trick.

@MooImABunny

"I'm glad we could help you guys entangled"
holy crap that was the most wonderful geeky thing I've heard in a while XD

@EchoL0C0

I feel like this video doesn't give Planck enough credit. Trying out lots of different ideas to re-create a distribution is not the same as mashing random buttons. For one thing, all buttons have a chance of getting pressed, but not all ideas (such as dividing the whole equation by 0) are valid.
Also, it makes coming up with all these ideas sound a lot easier than it is.
Lastly, his result was caused by trial-and-error, not pure random chance.

@vinayseth1114

9:27- Who else laughed when he said 'As usual, it took Albert Einstein...'? :D

@jackhill2765

Thank you for (1) a clear, concise and comprehensive explanation of exactly what the "ultra violet catastrophe" was and how reformulating conventional wisdom (the Rayleigh-Jean Law) by incorporating  Plank's constant to form the Plank Black Body Law, quantized the relationship between frequency and energy, resolving the issue, (2)  for confirming that the flaw in the Rayleigh-Jean Law was fundamentally the same misconception as that leading to Zeno's paradoxes, and finally, (3) for tying it all together by showing how the fallout from Plank's idea essentially resolves both issues not to mention giving birth to QM.   I also appreciate seeing the actual Rayleigh-Jean Law & Plank Black Body Law.  Understanding the history is a necessary first step toward understanding the result.  Extremely well done!

@maycksonvogas3129

Awesome!! That was the best explanation of Plank constant since my high school, I never got very well this subject. When you think of a limit of the quantum scale, really simplifies it. Thanks

@SayyadinaHeresy

Thank you so much, PBS Spacetime for these videos on the quantum realm! They are so clear and concise! I'm very much enjoying these!

@T33K3SS3LCH3N

Math teachers: Zeno's paradox is easy. You can overtake the tortoise because we have calculus.
Quantum Physicists: WE DONT EVEN KNOW WHERE YOU ARE

@albertrenshaw4252

Favorite line of the video: 9:22 "As usual, it took Albert Einstein, to..." Lmao

@vishalmishra4408

Max Planck may have never imagined that his constant would be used in 2018-19 to define New/Quantum SI unit of Mass (the Kilogram Kg).