The h Bar

Swapnil Das

04:30

hello.

DanielSank

This excellent question deserves an excellent answer.

rob

7

Q: Unitary evolution even after tracing out degrees of freedom

In quantum mechanics it is usually the case that when degrees of freedom in a system are traced out (i.e. ignored), the evolution of the remaining system is no longer unitary and this is formally described as the entropy of the reduced density matrix ($S = Tr(\rho\ln{\rho}$)) attaining a nonzero ...

Sir Cumference

04:48

Should I watch star wars?

Swapnil Das

@SirCumference Why do you ask, Monsieur?

=P

Sir Cumference

@SwapnilDas Well because of stuff like this

This summarizes my life

Swapnil Das

Rofl.

I don't face such problems, luckily.

Sir Cumference

Lucky :P

Swapnil Das

Hehe. I rarely interact with classmates.

Sir Cumference

04:53

Though I worry that I'll be terrified by the astronomical inaccuracies

Swapnil Das

So never watch. You'll get nightmares ;P

dmckee

@DanielSank I, too, have a high school teacher I kept in touch with. She argued the administration into letting five of us take a second semester of computer programing (basically a intro data structure and algorithms course) if she could teach it in parallel with one of her normal courses.

rob

@SirCumference After many years as a snob, I've decided that ignorance of pop-culture stuff is no more a point of pride than ignorance about anything else.

dmckee

She basically just set us loose to 'do the problems in chapter [N]` every two weeks and discussed our problems whenever no one else needed her.

Sir Cumference

@rob Well things like Harry Potter were worth reading

Not sure if Star Wars will be worth the time, though, since it's loaded with astronomical inaccuracies

Those things make me cringe

rob

05:05

@SirCumference Harry Potter is a remarkable three-thousand-page novel published in seven volumes

... which is also loaded with astronomical inaccuracies. ("Did you know that Jupiter's moon Europa is covered with mice?")

Sir Cumference

@rob I wouldn't say "loaded", I can only think of two or three cases

The other 2,997 pages were worth it

rob

@SirCumference Well, there are plenty of other foundation flaws in Harry Potter. Such as: magic

But it's not a story that you read to learn about how the world works. It's a story you read to learn about how people work.

Sir Cumference

@rob I suppose you have a point

@rob Au contraire, there was a ton of worldbuilding

Oh, did you mean the real world?

rob

If you have an educational bent, then you're going to encounter students who became interested in the sciences because of science fiction --- including Star Wars.

Sir Cumference

True

rob

05:12

And if your response to those students is "I always ignored Star Wars because of technical inaccuracies," you'll probably lose the sale.

But if you can appreciate a good story, and perhaps take some inspiration from the fanciful stuff, then you could steer a creative and imaginative person into a productive career improving our world.

And all for twelve dollars at the cineplex. Seems like a bargain to me.

Sir Cumference

@rob You sound like an engineer :O

rob

@SirCumference I'm not, but I have a lot of respect for good creative engineers.

DanielSank

@dmckee It's interesting how often successful scientists have stories like that.

Oh also, please click the "Dan gets a hat link" in the star board.

I'm not 100% sure it works, but it might.

user228700

06:30

Ello, everyone :-)

John Rennie

@Kaumudi.H: I mentioned The Gatekeepers to my niece and it turns out she's already a big fan. She's read the first four books and has the fifth one to read next.

user228700

Oh, nice! The fifth one is my favorite! If my memory serves me correctly, it is the last book and it's called Oblivion.

John Rennie

Have you read Horowitz's other books?

user228700

No, just these 5, I'm afraid. Shortly after I finished Oblivion, I took a long (and ongoing) hiatus from obsessive reading...

user228700

Does she recommend the Alex Rider series? (To an almost 18 year-old)

John Rennie

06:34

She started out with the Alex Rider books and loved them. However she now says they're a bit childish.

user228700

Oh, okay. I'll maybe pass, then...

John Rennie

Since she's 15 I'd guess they'd be much too YA for you.

user228700

Hmm, on the contrary, do you know that YA is often described as best suited for ages 16-21? I don't think our definitions of YA matches :-)

John Rennie

Possibly, but books vary a lot. e.g. the Harry Potter books are great for 55 year olds :-)

user228700

The Harry Potter books are great for humans at all stages of life. Period.

user228700

06:36

Anyhoo, I ate a chocolate pizza last night...

John Rennie

The Hunger Games books are actually pretty adult as well. But I gather (I haven't read them) the Alex Rider books really are targetted at say 12 year olds.

Oh yes!

How was the chocolate pizza?

user228700

@JohnRennie Ah, I see. Yes, THG are kind of adult-y...

user228700

To put it as lightly as I possibly can (/this chat room's decorum allows), the chocolate pizza tasted like CRAP.

John Rennie

Ah, that's a shame

user228700

Hmm, let me try to find an image...

John Rennie

06:38

@Kaumudi.H Not of you throwing up I hope :-)

user228700

:-) No. I was unable to find anything that remotely resembled what they actually served but it was basically melted chocolate, nougat and some pieces of brownie on a tortilla base.

John Rennie

That sounds ... quite nice :-)

user228700

I hadn't anticipated the tortilla and it made it worse. It was the worst type of pizza that I have tasted so far. That's 200 rupees that I'll never get back and arfhg, I could've just bought two Choco Lava cakes for that much money, which sounds less delicious and filling than a whole pizza but considering the fact that I threw away one piece...

John Rennie

Would it have been better on a bread base?

Like a deep pan I mean?

user228700

Yes, I feel that it would've been better on a bread base, which is what I thought I was getting but tortilla made it so much worse.

John Rennie

06:44

Ooh, chocolate lava cakes

user228700

I wouldn't go so far as to proclaim that all types of chocolate pizzas are bad just yet. I kind of hate nougat, which, I think, was the main problem...it was nauseating.

user228700

@JohnRennie Yep yep yep! :-)

John Rennie

Ah. I must admit I like nougat. Well I like nougat bars - I'm not so sure about using it in cakes.

user228700

*Pizzas

John Rennie

Well yes, it said pizza but really it was a sort of cake

user228700

06:47

I'm still not very sure if it was certainly the nougat. It was...fibery. (::Shivers in disgust::)

John Rennie

I get the impression that Indian cooking doesn't use self raising flour much. Is that a fair impression?

user228700

@JohnRennie On tortillas?

user228700

@JohnRennie I'm inclined to agree.

John Rennie

An unleavened cake :-)

user228700

Indians don't really bake...at all. (Except when we're baking, of course)

John Rennie

06:49

Cakes in the UK invariably means something cooked with self raising flour to give a sponge texture.

user228700

Whoa, no, "sponge texture" is okay! This one was fibery. Bleh.

John Rennie

That does sound odd. I wonder what they had used.

user228700

It was white and also tasted of vanilla.

John Rennie

Oh well. Whatever doesn't kill you makes you ... erm ... vomit? :-)

user228700

No, I'm like Ted Mosby from HIMYM. Vomit-free since...oh, crap, I was sick last month. Dang it.

koolman

06:55

Good morning

user228700

G'morning, koolman :-)

Swapnil Das

07:41

Afternoon.

user228700

How are u all celebrating New Year's Eve today?

koolman

Family party

Secret

-5

Q: Why isn't the EM spectrum considered its own dimension/realm/layer to the universe?

If all EM waves are in superposition until a packet is measured, then this could be a dimension/layer where all superposition events occur?

quantum-mechanics electromagnetism waves

Why are some people think the EM spectrum is a spatial dimension or something?

Never understood what these people are thinking

Swapnil Das

09:17

Hi

What were Einsteins contributions to physics after 1915?

Secret

09:46

How games usually treat alchemy:
$$\exists \textrm{universal resource (a wildcard resource)} u$$
given some homogeneous process $g: \textrm{wildcard} \rightarrow \textrm{desired item} x$, $g(u)=x$ and $g(au)=ax$ $\forall a \in \mathbb{R}$

That's equivalence exchange in a nutshell

AccidentalFourierTransform

12:09

Happy 2017 everyone :D

Secret

12:25

[Division by zero]
Conjecture: Associative commutative binary division by zero is not interesting in finite sets
Prove: TBD after bath!

Definition of not interesting: The addition structure contains a one sided null semigroup of size at least 3

AccidentalFourierTransform

Ah, @Secret, you never fail to make me laugh

Kenshin

12:47

Hi Accidental Fourier

Hi @Secret

@ACuriousMind can I ask you something

is there an age limit for moderators on stack exchange?

AccidentalFourierTransform

@Kenshin good afternoon

@Kenshin no, I don't think so

Kenshin

Do you think there should be?

ACuriousMind

@Kenshin None. I think there have been 15 year old moderators that got elected.

Kenshin

@ACuriousMind I ask because what if a young moderator has to rewview potentially inappropriate material

AccidentalFourierTransform

IIRC HDE 226868 is young

Kenshin

12:50

e.g. on my site physics.qandaexchange a user (S007) has posted rude 18+images and because the user is new, his posts required moderation before the posts appear on the site

I have reviewed and deleted the message

but I wonder given this possibility if moderatrors should all be 18+

ACuriousMind

@Kenshin They then will either review it or delegate that task to someone else.

Kenshin

but they can't un see what they've seen

once they realize the image is inappropriate for them, it's too late

ACuriousMind

@Kenshin They could equally well see the content by just happening to look at it when it gets posted.

Kenshin

no

mabye on SE yes

on my site new users with low rep need content approved by moderators

before it appears on the main site

AccidentalFourierTransform

I guess that when someones volunteers to be a moderator, they have to accept that they might stumble upon some inappropriate content sometimes

ACuriousMind

12:54

@Kenshin Yes, on SE, this is the case - there is no content that gets held in limbo before it's reviewed, everything is posted immediately and then reviewed as needed. (However, SE has some very good automatic spam filters, I'm told)

Kenshin

@heather if you have any emails from physics.qandaexchange in the last few hours please delete them and don't look at them

@heather, S007 had returned to the site and posted inappropriate images for review that I've deleted

@heather these images aren't appropriate for users under 18. What is your opinion on potentially viewing 18+ content requiring deletion?

@ACuriousMind thanks for the help, I'll see what heathers opinion is too and if she's happy to remain a mod

ACuriousMind

Also, what AFT said - if you're not able to deal with inappropriate content, then don't become a moderator. But I have no general concerns that 14-18 year old might not be able to handle "inappropriate" images. This is the internet, there's thousands of "inappropriate" images, texts, videos and whatnot just a mouse click away.

AccidentalFourierTransform

I AM QFT NOW

Buzz

I just had to flag some gay porn spam on another SE site yesterday.

ACuriousMind

@AccidentalFourierTransform lol

I edited :P

Kenshin

12:57

@Buzz r u young?

AccidentalFourierTransform

(but I saw)

Kenshin

@AccidentalFourierTransform did you like?

ACuriousMind

Typing Q before FT seems to be muscle memory for me, I guess

AccidentalFourierTransform

@Kenshin lol, I was talking about ACM's comment

Kenshin

lol

Buzz

12:58

No, hah. But I could have been.

Kenshin

yeah do you think there should be an age limit Buzz?

can a user under 18 really consent to viewing 18+ content?

perhaps one for legal stack exchange

Secret

in Zero term algebra, 24 mins ago, by Secret

(Revised) Corollary 3.2: Zero inverse are permutations in finite structures: Given an associative division by zero algebra $S$ with an underlying set of cardinality $n \in \mathbb{N}$. If there is a left (right) zero inverse $c$ and left (right) identity $1$, then the semigroup action of $c$ on $S$ is a permutation.

in Zero term algebra, 48 secs ago, by Secret

Proof: Let $0a=b$ be a left zero term. By Corollary 3.1, $0a$ is unique for some $a \in S$ (That is, the left semigroup action of $0$ on $a$ is injective).
Multiply both sides by $c$ to get $c0a=cb$. Using the left identity $a=cb$, which is also unique since $c$ is the left inverse of $0$. Hence the semigroup action of $c$ on $b$ is injective. It remains to prove that $c$ is surjective. Since $S$ is a semigroup, $(0a)1=0a \in S$ for all $a\in S$. Thus $0a$ exists for all $a \in S$. Now if $0$ is not surjective, then there exists $U \supseteq S$, that is the codomain of $0$. This is impossib…

First part of the third division by zero no go theorem

Buzz

After seeing that, I think an age limit would not be inappropriate. I had a talk with my wife (a mod on several other SE sites) about how frequent porn spam was. (She said she's never seen it as a mod, actally.)

wendy.krieger

It's past 11 pm here. Sydney would already be in the new year, and adelaide is next (at 17 minutes away)

Kenshin

13:14

happy new year wendy

did you see the fireworks

SchrodingersCat

Happy New Year wendy...

Kenshin

hi Schrodinger

r u accidentalfouriretransfor

wendy.krieger

Not from here. Sydney is a cheap immitation of ours.

Kenshin

didn't u go to southbank wendy

wendy.krieger

no.

SchrodingersCat

13:17

@Kenshin Hello Kenshin

Kenshin

y6

y

wendy.krieger

mother does not like me wandering around too late at night.

Kenshin

ok fair enuf

wendy.krieger

specially since she is very old

Kenshin

how old

Buzz

13:18

There's a hat for getting a starred chat within \pm twelve hours of New Year's UTC.

wendy.krieger

she was born 7 years into this century

i know

Kenshin

this century?

wendy.krieger

UTC new year is 10 am here.

Oh 1920-2040

Kenshin

so she was born in 2007

SchrodingersCat

@Buzz Well SE has this unique New Year gift ... Thanks for reminding ...

wendy.krieger

13:19

1920+7 is 1927

Buzz

2007 was a good year.

AccidentalFourierTransform

@Kenshin therefore, she cannot be a moderator here

Kenshin

y not

@Buzz what happene din 2007?

wendy.krieger

This year is in base 12, 1,2,0,0. A turn of that century

AccidentalFourierTransform

@Kenshin shes underage

SchrodingersCat

13:20

BTW Is there an upper age limit for being a SE moderator?

Buzz

I had a kid that year too. I wouldn't want my nine-year-old moderating anything though.

wendy.krieger

or a gross year

Kenshin

@AccidentalFourierTransform there is no age limit

AccidentalFourierTransform

@SchrodingersCat being dead.

Kenshin

@AccidentalFourierTransform and we're talking about wendy's mum, luckily wendy's mum isn't applying to be a mod

SchrodingersCat

13:21

@AccidentalFourierTransform Well I am half dead , half alive ... What about me??

Buzz

Honestly, I wouldn't want my older kid moderating anything either.

wendy.krieger

She was born a long time ago.

Kenshin

@wendy.krieger what chanel is the fireworks on?

AccidentalFourierTransform

@SchrodingersCat lol

wendy.krieger

nine, i think

AccidentalFourierTransform

13:22

you can moderate when nobodys looking

wendy.krieger

we're too close to the tower to see it.

SchrodingersCat

Wow that's really cool ...

Buzz

If nobody looks, which option you choose is never resolved!

Kenshin

nope not channel 9

channel ABC i think

hi @Kaumudi.H hi @heather

heather

hello

user228700

13:24

Hihi :-)

AccidentalFourierTransform

@heather g'morning :-)

wendy.krieger

I don't recall them doing brissie's fireworks at NYE.

mainly sydney.

heather

@AccidentalFourierTransform, good morning to you too =)

wendy.krieger

11:25 pm = morning??!?

Kenshin

@heather hope you didn't see any of those images on physics.qandaexchange?

user228700

13:25

Oh, hey, @Kenshin: It's almost midnight there, isn't it?!

Kenshin

@Kaumudi.H sure is :D

I saw the fireworks earlier

there are two sets

user228700

:-D It's 7:00 PM over here...

user228700

Oh, cool!

heather

@Kenshin, interestingly, I didn't get any emails, and I haven't looked on the site yet because i literally just woke up.

did you, uh, you know...take care of matters?

i thought we'd blocked his IP address.

Kenshin

@heather yes I think all of the images are deleted now

heather

13:28

well thank you.

Kenshin

@heather but it raises the question

it is possible users may post content that shouldn't be seen by people under 18

heather

@Kenshin, before we talk about my status as moderator

is S007's IP address blocked?

i thought it was from the last set of spammings

Buzz

It must have come up before elsewhere on SE.

Kenshin

he has multiple IPs

every one that is known to be associated with him is blocked

heather

::insert expletive here::

wendy.krieger

13:30

?

Sanya

who has got a static IP nowadays?

Kenshin

it was the user "stackexchange" who posted the images

heather

@Kenshin, so, he could pull another IP address out of thin air.

ack.

Kenshin

yes

@heather the images never made it to the live site

wendy.krieger

People who run their own ISP have static IPs

Kenshin

13:30

but they did require approval

wendy.krieger

I know one or two

Kenshin

and he posted like 10 of the same image

I don't know what motivates him to put in so much effort to post these images

Sanya

@wendy.krieger yeah well ... ...

heather

@Kenshin, right. last time he did that too, they were just a bit less, uh, inappropriate.

Kenshin

yep

oh did you see the image?

heather

13:31

the images from this time?

no.

Kenshin

cool

this is the question i created:

0

Q: Age Limit for Site Moderator

I have recently developed a physics problem solving website where users post questions and answers. Users of low reputation on the site require their posts to be reviewed by a moderator before the posts appear on the live site. There is potential that a new user could post inappropriate images ...

internet

heather

depending on the legal aspect of course, I would like to stay a moderator.

Kenshin

@heather well you're a great moderator so I'm glad to hear that

heather

thank you.

Kenshin

but I don't want you to be scarred by these images

Buzz

13:34

"Suppose there is a physics problem solving website"? LOL

heather

sure, yes, and i appreciate that you let me know about this.

Kenshin

@heather this time yes, in future I might not see it first

but if you're comfortable with potentially seeing this stuff then all is good

Sanya

@Kenshin Kenshin, apart from the issue of protecting people, a legal age limit on an anonymous site will in general not be easy to implement ...

Kenshin

there is no age limit of stackexchange for moderators so I think it is probably ok

heather

i don't know if I'm comfortable with it, per se, but i am willing to continue to moderate.

hmm, it might be interesting to create a bot to try to analyze images to try to find/delete this sort of content in advance.

Kenshin

13:36

@Sanya while a legal age limit cannot be verified, I could have moderators agree that they are over a certain age. If the moderator lies and then sees explicit material, it's their fault

heather

i don't know if that's possible though.

@Kenshin seems like just agreeing to the risks of moderation to me.

Kenshin

yep

Sanya

@Kenshin yup, which actually seems like a good idea to me - in general letting people acknowledge that they read user-posted content at their own risk

Kenshin

@Sanya yeah that might work

Buzz

SE may need to implement something to cover themselves legally. But it somebody underage works to evade the age restrictions, that probably frees SE of any liability.

Kenshin

13:37

@Buzz what age restrictions are in place on SE though?

there are none, so how is SE free from liability?

Buzz

Of corurse, IANALAIAP.

No, I meant that if they did impose restrictions on moderators. (And maybe they should.)

Kenshin

yes then I agree with you

if someone ticks a box declaring they are 18 and they're not, I think it frees SE from liability

unless they are so young they couldn't even read what box they were ticking ;p

Buzz

Yes, that's what I meant.

Kenshin

yeah cool

@heather I've updated the moderator agreement on physics.qandaexchange.com

I'll assume that by continuing to use the site you agree to the updated terms

heather

okay

yup

Kenshin

13:52

@heather if you see lots of posts requiring review and you see an inappropriate image, pls just send me msg and I will review the remaining posts

heather

@Kenshin, thank you for the offer; i'll do so.

Kenshin

10 seconds

I can see fireworks from hjere

heather

oh, i forgot it's night for you

Happy New Year!

Kenshin

Happy new year!

heather

2017: it's prime.

that was the problem with 2016.

user147690

14:07

New year happy.

ACuriousMind

@Kenshin Might be more of a question for Community Building

Kenshin

Happy new year @AlexClark

ACuriousMind

@Kenshin We only agree that we are 13 or older by signing up in the first place; SE doesn't have any notion of age restriction, mainly because none of the sites has a topic of a nature that would inherently be understood as "adult" in most cultures.

Although you might be concerned about Homebrewing or Beer & Wine ;P

Kenshin

I see

lol

wendy.krieger

2016 is 14*12*12. A kind of dozenal century, so to speak

don't you look at other bases!!!

In base 3/2, it's 000001200.

Wendy was looking for hats too. But too bad.

heather

14:23

@ACuriousMind, let's say a user has been suggesting a lot of middling to not helpful at all edits. Is there any course of action there?

DHMO

what on earth is base 3/2?

wendy.krieger

It was part of a mathematical theorm i was trying to prove, that if you can linearise an array of stones on a 2d abacus in one direction, you can do it in any direction.

ACuriousMind

@heather Raise a custom mod flag. We can ban individual users from suggesting edits or reviewing if it's clear they're using those priviledges consistently to no good. I'm not sure we've ever done so because we put the bar for "no good" rather high.

heather

@ACuriousMind, yeah, i don't think it's quite that serious.

wendy.krieger

Base 10 is 10/1, you add a zero to the end, and it makes a multiple of 10, and at the front, multiplies it by 1. Here a zero on the end tripple it, and at the front doubles it.

dmckee

14:26

@Kenshin It's worth noting that the particular age (13 years) is chosen because of US laws relating to internet sites that maintain personally identifiable information on children: the essentially require expensive and cumbersome record keeping and other guarantees.

wendy.krieger

So 12 is 3+2*2 = 7. And you successively double and tripple it, to get 2016.

dmckee

And the law uses that age as the definition of "child".

Kenshin

@dmckee ty good to know

wendy.krieger

It is nearly New Year in the top end.

ACuriousMind

The new year is still 8 1/2 hours away here

wendy.krieger

14:30

Gosh, you must be west of cook!

Kenshin

Auld Lang Syne (With Lyrics and English Translation)

►

ACuriousMind

@wendy.krieger Pretty far west, I'm in Europe :P

wendy.krieger

I heard told that's well past gatton.

ACuriousMind

I don't know who or what gatton is

wendy.krieger

Gatton is sixty miles west of Brisbane, australia. The proverbial black stump.

wendy.krieger

14:53

i might go to bed at 2017.0101.0101.

Or in base 12: 1201.0101.0101

user228700

Ey, @Kenshin: Happy New Year! :-D

Kenshin

Happy New Year @Kaumudi.H :D

what time is it there?

user228700

8:40...

Kenshin

oh i'll see you in 2017 soon

wendy.krieger

8 40 pm i take it.

Kenshin

15:01

@Kaumudi.H do you know S007? He's spamming site again

user228700

@wendy.krieger Yep.

Kenshin

that's his new year's party

wendy.krieger

Must be near india

user228700

@Kenshin What?! Which site?

Kenshin

physics.qandaexchange.com

user228700

15:01

Define "spamming".

Kenshin

posting porn

luckily the anti spam protections have prevented any such images reaching the live site

user228700

Oh Dear God. In answers and all?

Kenshin

he tried yep

but the posts needed mod approval which I rejected

user228700

Wow, that really really sucks...

wendy.krieger

I think the person in question was actually hammering inapproariate info.

Kenshin

15:02

now he's resorted to using the feedback form at the bottom of the page lol

user228700

Spamming that?

ASuckerinMaths

Hey

Kenshin

it causes no harm, but he's sending me lots of emails with links to bad stuff (which i'm not clicking on)

cos it's obvious the links are dodgy

user228700

Damn. People on the internet can be real weirdos sometimes and you never even know...

Kenshin

yeah

when he was Doraemon I thought he'd really changed

so sensible and quite knowledgable too

and then just changes like a switch

user228700

15:05

:-/ That really sucks...

Kenshin

yea

it has it's pros tho

user228700

Yeah, u get to improve the site :-P

Kenshin

he's testing the site for me, and I can improve the spam prevention

exactly :)

user228700

:-) What time is it over there?

wendy.krieger

Night all + sundry Have a happy new year, wherever you are.

Kenshin

15:06

1AM now

goodnight wendy

wendy.krieger

It's 0106 here,

user228700

Oh, okay...when u gonna sleep?

Kenshin

prolly soon

user228700

(@Ken)

user228700

Okay...

user228700

15:07

I think I'm gonna sleep in like, half an hour :-P

Kenshin

lol k

i'm just listening to a few more tunes

user228700

Oh, you're listening to music?

Kenshin

yea/

4sure

user228700

4sure? :-|

user228700

Oh, right.

user228700

15:09

Alright, I'm gonna go too. Byebye :-)

Kenshin

laterz KAumu

user228700

Happy New Year, everyone! :-)

koolman

@Kaumudi.H Happy New Year in advance

Mladen

15:50

hey guys, how's it hangin?

DanielSank

Good.

Mladen

The chat seems rather empty today.

Physics Meta

1

Q: How to handle questions about "physical meaning"?

I'm sorta new here, so this may already have a standard procedure, but I haven't found it anywhere if it exists. Anyway, I've been seeing a lot of questions along the lines of: "What is the physical meaning of ____?" "Is there a physical interpretation of _____?" "Can someone give me a REAL exp...

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