Quantum Cooling to (Near) Absolute Zero

Getting down to liquid helium temperatures (4K) may be fairly straight forward, but cooling below that requires taking advantage of quantum phenomena. In this video Associate Professor Andrea Morello from the University of New South Wales explains how 'zero-point motion' makes it possible to use Helium-3 and Helium-4 in a dilution fridge to get down to only thousandths of degrees above absolute zero.
It is this technique which is used to cool the MiniGrail at Leiden so that it can act as a gravitational wave antenna.

[datgoatfilms]

I guess I'm not alone in thinking this guy is a great professor.

[duanewente]

Quite possibly the best simplification I've heard.. This guy clearly knows his stuff very, very well.

[edancoll]

"Huh, is this guy Italian?"
0:44
"Yep, he's Italian."

[HeatherSpoonheim]

Unfair - being a vampire he has had centuries to learn all of this!  How can we mere mortals be expected to keep up?

[jraybozy]

i want long audio file of this guy just talking about anything.  It could literally be anything and i would be content.

[CowTipper]

This guy could say anything and sound smart

[dibyayan]

I don't know how researchers like this guy can keep so much information in their brain that too crystal clear ... explaining without the slightest hesitation

[jacktumbleweed]

THAT MAN NEEDS AWARDS! I absorbed more information watching this video than my entire senior year in high school.

[timsmith]

Didn't Feynman say " if you can't explain it in simple terms, then you don't understand it". This educator is a great communicator as well! Thank you.

[karlssus]

This guy is the kind of professor that most of us will never be lucky enough to have. Incredibly enthusiastic and intelligent, and able to communicate ideas so clearly that you understand the concepts almost instantly.

[adamcolon]

Wow... I actually understood the entire video. VERY well explained. Especially the application of using a cooled copper ball to detect gravitational waves and why it needs to be cooled.

Well done!

[stiimuli]

I'm rather amazed I understood that O_O
That guy is good at explaining this stuff.

[itsZybn]

Holy crap... I actually understood that!

[Eclipsed_Archon]

Best explanation of this process I have ever heard by far. Not too hard to understand, not too terribly slow, and just enough information while remaining on topic. This man should be the example for teachers around the world.

On top of that, I feel like I learned something in this video. Awesome vid Veritasium.

[princeistalri]

I love this guy. Something about his way of teaching is just so engaging, there's never a moment when you get bored and feel like turning away.

[dingdingdingdiiiiing]

brilliant, you can easily understand everything he's talking about

[bobfrank]

His hair length is directly proportional to his intelligence.

[heysoymarvin]

To all of you who are asking about where he is from. In the minute 0:44 you can see the international gesture of Italian people with his hands.

[TheKronosKeeper]

“If you can't explain it to a six year old, you don't understand it yourself.”

― Albert Einstein

[pd]

I come back to this video about once a year. I think I discovered it my last year of college, and I'm now in my 6th year of a PhD program in biophysics. Over that time I've come to realize just how brilliantly this professor explains a VERY confusing process in a way that anyone with basic science knowledge can understand. Having struggled to explain my research for years - and it's much simpler than this - it's SUPER impressive. As Einstein [allegedly] said... "The definition of genius is taking the complex and making it simple."