You videos are like a small refuge from this insane world. A short place in time where reason, curiosity and wonder still exist like they did when I was a child. Thank you

My favorite bedtime story. Her presentations are so relaxing and thought provoking.

I am a time traveler, moving forward in time.

Great video with some really excellent examples! Minor correction for 02:00 You say every atom in a person's body is replaced every 7 years. That's based on the common misconception that every cell in a person's body is replaced every seven years. This misconception comes from a paper written by Jonas Frisen and published in Cell in 2005, where he estimated that the average age of every cell in the human body is only 7 to 10 years old. The press ran with the headlines that eventually fell into common knowledge despite being wrong. I too fell for that common knowledge trap, but when I looked it up, I found out that while many parts of the human body will be replaced within the 7 to 10 year mark (much of it will have been replaced many times), apparently some parts of your body never actually get replaced like tooth enamel, the lenses in your eyes, and the vast majority of your brain cells, while some parts, like your stomach lining, might get replaced every couple of days. As for the atoms specifically, a study from Oak Ridge Lab in the 1950s said that 98% of all the atoms in your body are replaced every year. Some conversations that I found questioning it suggest that the 98% might be random, meaning many of the same cells would get hit reguarly while others nowhere near as often. Possibly taking 16~ years to replace all the atoms that could be replaced. I personally find the researcher's use of strong absolute wordings in interviews about it despite the findings being heavily based on extrapolation to make me feel less than confident in its findings, but I didn't spend too much time looking around for people attempting to prove or disprove that study, so I won't suggest taking my word on it's validity. Anyways, kinda unrelated to the video content, but you did an excellent job on your nails 👍

I loved when you mentioned how meditating puts us in a static space time ✨ very insightful

It was actually Feynman who first shot down the one electron universe with the whole more electrons than positrons issue. (Even though he took great inspiration from it.) Wheeler did think the antimatter could be hidden somewhere, but I dont believe Feynman was all that convinced.

You are the perfect blend of pleasing ASMR voice and great Physics / Math information. My body doesn’t know whether to fall into a pleasant slumber or stay peaked with interest. Great video and editing!

Tibees was very bright. She made a ship that could travel faster than light. She went out one day in a relative way, then came back the previous night. 😀

Such a nice video! I've been watching you for all of my university career (now almost 7 years) and I have to say, you're the best when it comes to videos about physics! Lots of love

I love this kind of social commentary on science topics. Love your work Toby.

That Quasar theory in the Einstein related book was really interesting. Your videos are really cool, your voice/accent and narration make them really fun and interesting to watch. Thanks for all the awesome content.

You're back, and always bring such interesting content and topics to discuss! Appreciate you, Tibees!

the first book encapsulates my understanding of how time works in our experience best, really glad I found your videos, new fan

I don't know anything about physics, I'm just here for the voice. Thank you

Glad to see your back. I love the content!

Very interesting topic along with the several theories presented. I'm a scifi fan of time travel also. Coincidentally, all this past week I've been binge watching previous episodes of Dr. Who. Thanks for the effort you put into the presentation Tibees. 👏

I love your physics videos and shorts! Please keep posting more of them 🙂

I just rediscovered your channel and can't tell you how wonderful it is to be back here!

You have a calming voice and make informative videos. You have a new subscriber!

I always enjoy your videos and how well thought out your presentations are. Thank you! I don’t know what’s happening in your life, but I feel compelled to comment that you seem very much happier in the recent videos. I do hope you have continued success and joy in your life. Thank you again for sharing with all of us.

2:02 I'm actually thinking of writing a science fiction novel based on this idea of "world lines" and the perception of a single lifetime. It's going to be titled "The Hive Dynasty" and I am currently brainstorming ideas. Hopefully I'll get this published before I graduate university in 3 years. Also, amazing video as always Toby!

Absolutely fascinating. Well done Toby! 👌

I'm about to start an extended project qualification (in my last year of high school) on the physics of time travel, so this was really interesting and relevant! Thank you for the reading list!

thank you for these. Your videos are such easy listening.

I loved this! Wow! Is there more videos like this, showing mind-blowing concepts and different interpretations?

So lovely, I'm enamored by your intellect and delivery of such complicated ideas.

My gawd, i could watch and listen to you all day!

This is so impressive. More on this please!

Your channel is just a breath of fresh air. Even imagining those concepts gives me a pleasure.

Your videos are the reason to understand physics easily and start to loving it

Awesome ❤ One of my absolute favorites of your videos THANKS! ❤

What a poetic view on time! I love that theme! I’ve been writing poems on it.

Absolutely brilliant. This video is a great mix of science, the unknown, and meditation

You are so fun to listen to, keep up the great videos!

I'm enjoying your videos! Thank you for your passion and sharing

Lately I'm obsessed with time travel, this was a great watch. thanks Tibees.

We appreciate the amount of hard work and research you’ve provided. We will support you no matter what.

Nicely presented & concise intro to this absolutely fascinating aspect of the physical world, plus basing it around that small group of books was a good move IMHO 😉... I really can't see how a more thorough yet accessible presentation of this captivating yet frustrating topic could be have been made in 15 mins 👍! Cheers.

This video made me feel excited as when I was a child! I missed that feeling, thank you so much! Afterwards I starting investigating about entropy, time, etc lol

really, your video content is both educational and your own charm is clever, self-confidence is dizzying I wish the teachers in our education system had a quality vision like you we are following you seriously, if it has Turkish subtitles, you can follow it more closely, take care of yourself, stay in good days❤

This channel is a hidden gem

13:58 I wasnt expecting the sudden existential horror like that 😂

Pardon me, ur voice is super calm my feeling and very asmr thanks for all ur vids.❤

I really loved watching this video, I was intrigued the whole time, and understood about 0.5% of it. Thank you :)

This is fascinating - thank you!

Great overview of a complex topic! Ever thought of doing a similar piece on time travel in fiction with notes on the plausibility of the time-travel mechanism from the viewpoint of a physicist?

Thankyou for this wonderful video. I only just found your channel. WOW!! I loved watching this. You're a genius. 💛💛💛

Wow this blew my mind! And I love your cute bookmarks!!

Thanks for making a video on time travel. It is a fascinating thing ❤.

I literally cannot tell you how great your videos are. This one in particular. I’m a writer and was messing around with a time superpower and trying to understand it from a real life and real science or even theories standpoint is incredible keep it up!

You are my favorite KZfaqr. These videos are everything.

Love your channel

Your voice is so therapeutic!

What a therapeutic voice! Much wonder 🙌

So far as I can tell, one night when I was about 5 or 6 years old, I was laying in bed and looking at my dresser on the other side of the room. It was dark out, maybe an hour or so after sunset. I blinked, or at least I thought I blinked, and it was bright. Morning. I'm convinced that I fell asleep and just simply didn't dream. I experienced timelessness. That was nearly 30 years ago, but I remember it pretty clearly. I was confused for a while, didn't think too much of it as a kid, but eventually looped back to the memory and have always figured I just entered a state of thinking absolutely nothing. Crazy!

The concept of various modes of time travel are encouraging as are the paths approaching that of the speed of light with various scenarios.💞

Great video. Great explanations!

The diagram around 01:45 actually manages to almost show a geometric representation of the cause of length contraction. Any chance it was mentioned in the rest of the book? (Apologies if it's actually included in the remainder of the video, I had to make this comment before I forgot)

Luv your videos tibees, just found you recently and I think you’re quite intelligent :-)

Very interesting, thank you! Content on time travel and higher dimensions make my mind explode :)

I noticed the Toronto scene. Tyvm!

I love this subject ❣ thank you 🙏

7:45 basic existics and dimensional analysis for pin point labeling. Prime distance. Fold patterns for solenoidical matrices.

I love everything about this. More!

1:59 You showed a version of linear and space time curvature. Linear time and curved time, operate on two functions. (Line and spirals in geometry), 1) linear time is forward (only) 2) curved time leans back and forth, (swinging like one of those see saw bird toys drinking water). You’ll see these in Mandlebrots as well. Great video.😊

Thank you Toby, thanks to u i came to know & gotta a peek into these books that i would otherwise not have..

Question: can a quasar in that example behave separately from its perceived form or is it truly one form simply perceived as two like you mentioned?

I love this but I also love the history of science videos you do! Would love to see you cover outdated theories and show us how people in the past thought.

This is so good. Please make second edition

Very interesting. Thank you for this breakdown.

Thanks for dropping the college route so you can deliver such wonder to all of us.

Cool! Paul Davies' About Time was my first serious science book as a kid. I don't hear it mentioned often :)

A great realistic film about it was Donnie Darko. The directors cut DVD came with a ton of extra information as well.

I cant stop listening and looking at you 😢❤

Awesome, thank you for the suggestions 📚👌🤠

(Geometry, Relativity, and the 4th Dimension) What a cool way of looking at reality! 🙂

I wish so much that I had you for my 9TH grade math teacher. soothing math/science. So enjoyable.

good evening from Nigeria, my maths/physics teacher,there was a time i dreamt and saw a time maching,by then i was a 300 level physics student in the university, with ur explanation i hope to build one very soon

Excellent information. Really amazing. Wow ❤

Thank you! I've certainly always had such trouble visualising time travel.

Your videos are very knowledgeable

Your voice is like a unseen characters cosmic voice guiding humanity through the maze... amazing...

Paul Davies is a professor at the university I attended : ) I'd see him here and there at different physics events

I always read books that were made in the 50's, 60's that how I time travel to the past.

"You'd need a rocket the size of a galaxy." So essentially I'd need a TARDIS.

I keep wondering about the quarks. The up/charm/top stand out as different from down/strange/bottom and electron/muon/tau in that their charge sign doesn't follow their matter/antimatter label. You can collapse several separate conserved quantities (lepton, baryon and quark number) into a single charge conservation if you assume that's a mistake and it simplifies things a lot. Still works with the zoo of observed meson decay products. A bunch of related math would have to change but I think everything would still work. It gives you a picture of our universe with half matter, half antimatter. It doesn't get you a one-electron universe, though, unless electrons and positrons can somehow masquerade as quarks. It's almost like quarks in a proton are the gaps between three integer charge particles rather than the particles themselves.

is 1/4 pi effectively quantum pi? where half pi is a fixed measurement? at plank

We exist in a time bubble that is regulated not just by time but space. Because our bubble moves around the solar system at one speed, our galaxy at another and our galactic cluster at another, time travel alone would place us in a void. So consideration of the location of our bubble is a must. Travel back in time requires consideration of where one was at the chosen time destination. Forward in time needs to consider where we will be. Otherwise one would end up in the blackness of space. Your videos are always thought provoking and I thank you.

The idea of a 4D worm is prevalent in philosophy of physics as well. I believe it is discussed in 4 Dimensionalism by Ted Sider. My college thesis in philosophy of physics used that as a jumping off point and discussed the two major theories in the philosophy of time as modified by both relativity and quantum mechanics. Roland Omnes, a french physicist, wrote several good books on it, my favorite being Quantum Philosophy.

Thanks!

Hi Is there any way in this universe where our body can be enlarged or shrink , like gravity pulls us , is there any other force which can affect our body in different manner.

What an interesting video, well done!

4:20 reminds me of the three body problem by cixin lui

Its just beautiful, what people can think of

Awesome🎉

I'm too stupid to understand any physics based material but you're making it accessible here and dare I say it, fun!

Use a blackhole, it creates a loop-tunnel during the time it exists. It might not be possible to send matter through it, but you can send information, like a digital copy of your mind. You also need to build an reciever that can recieve and decode this information. And a "suit" in which you can upload your mind. The only issue is, yoy can only travel back (or forward) into a time when this reciver exists.

Every time I look into the night sky I travel back in time

OK, you convinced me to read them. I'll let you know when I get my time machine built.

The best asmr channel doesn't exi-