Rowan Cox · May 12, 2018 at 5:38 pm

Your website and videos are brilliant. I have just come upon them by accident today. Your enthusiasm, curiosity, and thirst for understanding are inspirational and infectious. You also display an excellent talent for explaining complex ideas through simpler analogies in a manner that focuses precisely on the idea you are explaining. I don't know your current career path (sorry, like I said I just discovered your channel today) but I think you should seriously consider working full time as an educator (if you aren't already). Outstanding work! (I'm a physics teacher by the way).

FluffyFractalshard · May 13, 2018 at 5:40 pm

love your enthusiasm! authentic and crazy.. are you the happiest person on earth?

PorterGreg Productions · May 13, 2018 at 11:09 pm

So when your fingers are wet and you can't text, is that because a wet finger has a different conductivity than a dry finger?

Shon ElectricShoes · May 14, 2018 at 1:08 pm

Touch at the right side of my phone is not working. Left is ok though.
And i can't press subscriber i can only 'like.

tiktok girl · May 18, 2018 at 8:47 pm

But then why does a glove not work on your phone but a sock does? ( i tried it )

Anita Tromp · May 19, 2018 at 1:52 pm

The phone is making the electrodes in my finger move?

UltraMind · May 21, 2018 at 12:32 am


Ankan Halder · May 25, 2018 at 3:51 pm


MADHU B · May 27, 2018 at 2:22 am

Wow. Super informative and fairly oversimplified. ^_^๐Ÿ‘

Gabe Maldonado · May 31, 2018 at 8:06 pm

Seriously, thank you. Just thank you.

Nicholas Bennett · June 2, 2018 at 6:21 pm

Now I wonder just how many people tried to make the poop emoji come up by typing all the ones and zeros. ๐Ÿ˜€

Dennis Andrucson · June 3, 2018 at 4:38 am

1:53 CURRENTLY being struck by lightning. LOL

charles wipman · June 3, 2018 at 9:50 am

Some years ago they'd published an study saying that there was an 8 to 12% of the world's population that phone touch screens didn't work with 'em, but the source didn't tell why it doesn't; are they or they'll be excluded?.

Chakshu Punj · June 3, 2018 at 3:17 pm

Screen is full of diamond grid, that's ok. But where are the meters present. Above the grids, down the grids, at the side of the grids or somewhere else.

Daniel Dawson · June 4, 2018 at 9:20 am

3:58 Very, very simplified. Well, it has to be, I suppose. However… 4:14 This is the UTF-8 encoding of that character. UTF-8 is used for storage and interchange, but not generally for internal representation; for that, it's much more likely to use something like UTF-16 or UCS-4. Also, all of these encodings are part of Unicode, and it's not even clear yet that you're touching a button (what's a button, anyway? the chip has no concept of that), so you're getting a little ahead of things. In reality, the chip is most likely figuring out the coordinates of where you're touching. This then gets sent to the operating system (still simplified), which then notifies the app that is currently displayed. The app figures out what touchable widget is at those coordinates, finds out it's the button for "insert the U+1F4A9* character", then adds that character to the string in the text box. Later on, assuming whatever protocol the app is using requires UTF-8 encoding, it converts the whole string to UTF-8, so that U+1F4A9 gets converted to the representation shown at 4:14.

* "U+####" is standard human-readable notation for Unicode code points, with the value in hexadecimal.

4:31 Hehe. "Roman alphabet", you say, as it clearly shows a Greek letter. ๐Ÿ˜€ A very appropriate letter, though.

Donald Kira · June 6, 2018 at 12:41 am

idium tin oxide

Edward Mupenda · June 10, 2018 at 9:13 am

dont even start with how animoji work

nawar maaroof · June 10, 2018 at 2:28 pm

The poop emoji is ,t poop its choclate ice cream

Puppieplaysmc · June 10, 2018 at 9:41 pm

Soo cool

Spirly Gul · June 14, 2018 at 6:44 pm

thanks for sharing, it is really cool to know about such things and physics behind them

mina86 · June 17, 2018 at 11:26 am

4:15 โ€“ technically this is binary for UTF-8 encoding of pile of poo emoji. This is why it does not match 1F4A9 if one were to naively translate it from hexadecimal to binary.

4:40 โ€“ Actually, Unicode has space for only a little over one million code points.

Macboer · June 19, 2018 at 1:44 am

Swearing in Binary is the latest fad.

Phantom Raven · June 19, 2018 at 2:57 pm

And this happens within fractions of a second

Science is amazing

Roger Barraud · June 22, 2018 at 1:30 am

"…*currently* being hit by lightning…"
LOL ๐Ÿ™‚

Roger Barraud · June 22, 2018 at 1:33 am

02:10 'exaggerated'

Roger Barraud · June 22, 2018 at 1:34 am

Suuuure … but can you play NotHotDog with a Pokemon?!1!

Roger Barraud · June 22, 2018 at 2:57 am

04:14 … Which is why we use Hex ๐Ÿ™‚

Roger Barraud · June 22, 2018 at 2:59 am

0xF09F92A9 ๐Ÿ™‚

Ztingjammer · June 24, 2018 at 8:46 pm


SouthEastern Kaiju · June 24, 2018 at 9:56 pm

" It's complicated " Got it.

THE ALL ROUNDER Cool Man · July 13, 2018 at 12:41 pm


Tripp Leude · July 16, 2018 at 8:00 pm


้™ณๆ›‰ๅฆ‚ · July 18, 2018 at 7:57 am


Variety of Everything · July 18, 2018 at 2:33 pm

Watching this on mobile

Kyle Chormanski · July 21, 2018 at 4:54 am

You make it sound more like chemistry than physics.

Hemambara kumar · July 22, 2018 at 2:58 pm

I like it ๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚

Valdagast · July 24, 2018 at 2:55 pm

Dear God, she predicted the Emoji movie. Except with ants.

ThePotaToh · July 25, 2018 at 12:30 pm

Getting some F*d in? Sounds dirty.

Joel Grayson · July 26, 2018 at 11:24 pm

No, it's the chocolate ice creamโ€‹ emoji

crackheadculture · July 30, 2018 at 5:10 pm

Can you be my science teacher?

sruthi suresh · August 11, 2018 at 9:46 am

So that's why my phone shows a rapid movement when I keep it under sunlight?! charges in sunrays changes the voltage???

nitin hirve · August 21, 2018 at 6:18 pm

Thank u mam…u r great…all love from #India

Aryan · August 22, 2018 at 8:22 am

Nice video.
What did u say at 4:37, something that appear only in—–……
Please tell that whole line from 4:35 to 4:38

B Hughes · August 24, 2018 at 2:04 am

So my question is: How big would a computer have to be today using the technologies back in the 1940s, tubes and relays???

Design an "Adder" circuit to add two 4 bit binary numbers together, one bit per circuit: https://www.youtube.com/watch?v=c4gcBZ8wQW8
Using analog switching devices (transistors, vacuum tubes, relays) to build digital logic circuits (And, Or, Not, Xor): https://www.youtube.com/watch?v=sTu3LwpF6XI
The definitive computer primer! Crash Course Computer Science: https://www.youtube.com/watch?v=tpIctyqH29Q

Jonathan Fataki · September 2, 2018 at 8:31 pm

"Thoughtful" lol

Brian Melendy · September 12, 2018 at 1:37 pm


VASANTHAPRIYA R · September 14, 2018 at 8:41 am

Incredible isint it?

Lee · September 18, 2018 at 2:10 am

You managed to fit the poop emoji into a lesson on physics. This has my vote (in 2018) for 2016's video of the year. Congratulations. Seriously though,(in case Dianna sees this) I've really enjoyed all of your content. Thanks for creating such a great channel.

Shivangi Tripathi · September 22, 2018 at 8:07 am

It was awesome…๐Ÿ˜„๐Ÿ˜„now its making think about all you said while typing this ๐Ÿ˜ƒ

Sam Yu · September 27, 2018 at 8:39 pm

Has Dianna always had a slight lisp? Or am I going crazy?

THINK · September 29, 2018 at 10:54 am

You looks very hot

KUMAR SO · September 30, 2018 at 6:24 am

You are best…๐Ÿ‘๐Ÿ‘๐Ÿ‘

KUMAR SO · September 30, 2018 at 6:28 am

I am so much in love with science….๐Ÿ˜‚.
Thanks universe for giving us science..

DKEvoX · October 3, 2018 at 8:46 pm

I feel like Physics Girl just put together the pieces and came to the understanding/realization that there is no imaginary hardware/software boundary, and it's all always just been electrical high/low pulses through logic blocks. Computer Engineering is awesome, highly recommend to anyone.

Tae · October 5, 2018 at 3:47 pm

Aww Love The video!! And you too!! ;D

HGNIS LUBAK · October 5, 2018 at 8:50 pm

So niceeee i like your smile๐Ÿ˜˜๐Ÿ˜˜

byugrad1024 · October 7, 2018 at 4:15 am

I'm an engineer, and believe me, we don't even really know how it all works.

Oli22 Oli22 · October 17, 2018 at 10:47 am

Wait for it…. wait…. Doomed!

Moneymyke357 · October 21, 2018 at 10:27 am

I find it amazing phones donโ€™t cost $150,000 for the incredible tech in them.

Brishty Hazra · October 21, 2018 at 5:33 pm

๐Ÿ‘ป๐Ÿค ๐Ÿ’€๐Ÿ˜ฌ๐Ÿ™„๐Ÿ˜‚๐Ÿคฃ๐Ÿ™ˆ๐Ÿ˜ฟ

Abhinav chauhan Gujjar · November 3, 2018 at 8:39 am

But i use a screen guard and i don't think my finger can conduct electricity through glass.

margic fumani · November 3, 2018 at 9:20 pm

Can you try another video explaining it deep
This is the knowledge I want

Venkatesh babu · November 8, 2018 at 4:09 am

Magnetic three d movement flux variance.

Jet Aviationxx · November 11, 2018 at 11:21 am

What a very touching video

Sai varun · December 30, 2018 at 7:17 am

The first time a science-related video had said ''Try it''

Gabriel Pedre · January 3, 2019 at 6:23 pm

Can you review how many physics this game has?:

Ace Combat 7: Skies Unknown? (just watch the trailer or the demos) and review it plz

Timothy Modeste · February 9, 2019 at 8:05 pm

Ijustine is better

L G · February 11, 2019 at 12:28 am

From a Programmer's perspective, I'd like to add one thing… The touch screen contact point is translated into an X-Y coordinate, and the programmer uses it as a coordinate to determine what you touched (which button, image or anything else). Leave the complicated stuff to the hardware guy. For the programmer it's just a message signal with X and Y coordinates.

Carlos Quesada · March 15, 2019 at 6:39 am

Thanks !

Saimoom Sikto · March 23, 2019 at 6:32 am

How does the samsung galaxy note 9 s pen works ……it has a low point

sion8 · March 29, 2019 at 8:46 pm

But why does ๐Ÿ’ฉ have ๐Ÿ‘๏ธ๐Ÿ‘๏ธ?! Is poop, not something else!

SoarAxe · May 6, 2019 at 6:13 pm

I love the way she made herself laugh with that ant analogy

stefan sauvageon · May 7, 2019 at 9:38 pm

3:07 It says: pG

stefan sauvageon · May 7, 2019 at 9:43 pm

11100010 10011010 10011011 00100000 11110000 10011111 10010010 10000001

martha de la rossa · July 1, 2019 at 11:34 am


MAR Mundo · July 11, 2019 at 11:04 pm

Emoji language expert, here. Let me translate 0:35 encrypted message: "I, with my finger, on my phone, write letters from the alphabet and it produces electric fluctuations. It tickles, but I love it!"

ฤฐlayda · July 24, 2019 at 10:20 am

What a thoughtful message ๐Ÿ’ฉ

Robert Masterson · August 3, 2019 at 1:34 pm

I know this was a very over-simplified description, but the lack of explaining what programming contributes turned me off. There's really no direct connection between you touching the screen and the 32 bit encoding of a typed character. The screen hardware tells the program where it was touched, and programming literally does everything else.

Ken Mullins · August 31, 2019 at 10:23 am

I really enjoy your videos. Thank you. Got a question for you. Why is it that I can move and type with my finger is a half inch from the screen?

Peter Kosen · September 13, 2019 at 5:01 pm

How do touchscreens work??? . . . . . . . . magic.

Nathan Wilson · September 20, 2019 at 2:44 am

Hey there friend! I hope youโ€™re having a good day, but if not, I hope this hello brightens it. Jesus Christ be with you!๐Ÿ˜Š

Nathan Wilson · September 20, 2019 at 9:15 pm

Hey there friend! I hope youโ€™re having a good day, but, if not, I hope this brightens it just a bit. Jesus Christ be with you!๐Ÿ˜Š

Joel Cleaver · October 1, 2019 at 2:37 am

I have intermittent zombie finger. What causes this?

CHANDHRA KUMAR · October 6, 2019 at 6:18 am

Can you please make a video on why coffee glass doesn't break though we pour hot coffee or hot water

Cassady Quick · October 7, 2019 at 10:08 pm

That odd look you get from people when they see you texting with a hot dog.

Miles Campbell · October 8, 2019 at 6:19 am

Physics Girl is cute ๐Ÿ˜‰

Tarang Patil · October 11, 2019 at 11:17 am

๐Ÿ’ฉ:- I'm so important and complicated

Tร pai Ferenc · October 27, 2019 at 5:24 pm

Ok emp hapen, the phon dz not respend!Feri.

david young · November 4, 2019 at 9:57 pm

isn't pi equal to spinning wheel of Egyptian chariot wheel wrapped with string and cut with knife to measure against its diameter?

Erkin Alp Gรผney · November 14, 2019 at 9:03 pm

Did you mean 0.5 milimetres at 1:10? 5mmร—5mm is too coarse.

Rajesh Patra · November 16, 2019 at 12:22 pm

You are so…….hot

Usama rafieck · November 20, 2019 at 9:40 pm

Do you have a job?

YASH ARABHAVI · November 30, 2019 at 7:11 am

Now I know Dianna's frequently used emojis… Sneaky๐Ÿคช๐Ÿคช๐Ÿคช

Christos Curtis · December 11, 2019 at 2:45 pm


PollieBear · December 11, 2019 at 3:57 pm

You can also use yer tongue ๐Ÿ˜›

Chetan Singh · December 15, 2019 at 5:08 pm

0:09 thoughtful message = ๐Ÿ’ฉ Emoji ?

Looking In With Victor B · December 16, 2019 at 5:19 am

11110000 10011111 10010010 10101001 Testing if this works

Edit I guess 1 and 0 are coded as well

AlphaApple · January 1, 2020 at 2:56 am

Since Apple has introduced the original iPhone in 2007, virtually all smartphones have a touchscreen that it has become a quintessential method of typing. Touchscreens also take superior convenience over physical buttons.

ismail amdah · January 7, 2020 at 6:26 pm

Thank you!

Jorge Silva · February 3, 2020 at 11:34 pm

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