According to our best theories of physics, the fundamental building blocks of matter are not particles, but continuous fluid-like substances known as 'quantum fields'. David Tong explains what we know about these fields, and how they fit into our understanding of the Universe.
Watch the Q&A here: https://youtu.be/QUMeKDlgKmk
Subscribe for regular science videos: http://bit.ly/RiSubscRibe

David Tong is a professor of theoretical physics at Cambridge University, specialising in quantum field theory.

The Ri is on Twitter: http://twitter.com/ri_science
and Facebook: http://www.facebook.com/royalinstitution
and Tumblr: http://ri-science.tumblr.com/
Our editorial policy: http://www.rigb.org/home/editorial-policy
Subscribe for the latest science videos: http://bit.ly/RiNewsletter

From Boltzmann to quantum theory, from Einstein to loop quantum gravity, our understanding of time has been undergoing radical transformations. Carlo Rovelli brings together physics, philosophy and art to unravel the mystery of time.
Subscribe for regular science videos: http://bit.ly/RiSubscRibe

Carlo's book "The Order of Time" is available now - https://geni.us/JjwvO

Watch the Q&A: https://youtu.be/NXcu0BlbTrM

Time is a mystery that does not cease to puzzle us. Philosophers, artists and poets have long explored its meaning while scientists have found that its structure is different from the simple intuition we have of it. Time flows at a different speed in different places, the past and the future differ far less than we might think, and the very notion of the present evaporates in the vast universe.

Carlo Rovelli is a theoretical physicist who has made significant contributions to the physics of space and time. He has worked in Italy and the US, and is currently directing the quantum gravity research group of the Centre de physique théorique in Marseille, France. His books 'Seven Brief Lessons on Physics' and 'Reality Is Not What It Seems' are international bestsellers translated into forty-one languages.

This talk and Q&A was filmed in the Ri on 30 April 2018.

---
Thank you for our Patreon supporters who help us make more videos like this:
Alan Delos Santos, Ashok Bommisetti, Greg Nagel, Lester Su, Rebecca Pan and Will Knott.
---

The Ri is on Patreon: https://www.patreon.com/TheRoyalInstitution
and Twitter: http://twitter.com/ri_science
and Facebook: http://www.facebook.com/royalinstitution
and Tumblr: http://ri-science.tumblr.com/
Our editorial policy: http://www.rigb.org/home/editorial-policy
Subscribe for the latest science videos: http://bit.ly/RiNewsletter.

Product links on this page may be affiliate links which means it won't cost you any extra but we may earn a small commission if you decide to purchase through the link.

⁣Inside Einsteins Mind: The Enigma of Space and Time

In celebration of the 100th anniversary of Einstein's general theory of relativity, leaders from multiple fields of physics discuss its essential insights, its lingering questions, the latest work it has sparked, and the allied fields of research that have resulted.

Subscribe to our YouTube Channel for all the latest from WSF.
Visit our Website: http://www.worldsciencefestival.com/
Like us on Facebook: https://www.facebook.com/worldsciencefestival
Follow us on twitter: https://twitter.com/WorldSciFest

Original Program Date: 05/30/2015
Host: Brian Greene
PARTICIPANTS: Gabriela González, Samir Mathur, Andrew Strominger, Cumrun Vafa, Steven Weinberg

Introduction with Brian Greene 00:00

Participant Introductions 04:25

What aspect of physics is so important that you would tattoo it on your body? 08:05

Steven Weinberg takes us from Newton to Einstein. 12:05

What was the observational support for Einstein theories? 19:20

Can Newtons ideas be extracted from Einstein's? 23:40

What did Einstein think about the Big Bang? 30:58

What did Hubble's observations discover? 33:39

What is the biggest unsolved problem in cosmology? 38:03

What is the history of Black Holes? 40:31

Einstein's thoughts on singularity. 47:33

What is a gravitational wave? 50:49

What does a gravitational wave sound like? 57:52

Combining General relativity and Quantum mechanics. 01:00:28

Cumrun Vafa on String theory. 01:10:50

Samir Mathur explains information loss at a black hole. 01:17:45

Black Holes to Wormholes. 01:28:45

Is the fabric of space time a physical thing? 01:32:24

What is the one question you would want answered in your lifetime? 01:36:37

✔️📚👉 Watch Full Free Course:- https://www.magnetbrains.com​
✔️📚👉 Get Notes Here: https://www.pabbly.com/out/magnet-brains​
✔️📚👉 Get All Subjects playlists:- ​https://www.pabbly.com/out/all-videos-playlist

===============================================
✅ In this video,

✔️ Class: 12th
✔️ Subject: Biology
✔️ Chapter: Organisms And Populations
✔️ Topic Name: Difference Between Exponential And Logistic Growth

===============================================

📢 🔥 Available (Kindergarten to 12th) all Video Subject wise Playlist https://www.pabbly.com/out/all-videos-playlist

Why study from Magnet Brains?
Magnet Brains is an online education platform that helps give You NCERT/CBSE curriculum based free full courses from Kindergarten to Class 12th so that you can perform well in any and all exams you give in your academic career.

👉 Contact us 🤑🤑
➡️ Connect with us : magnetbrainsbhopal@gmail.com
➡️ Website : https://www.magnetbrains.com/
➡️ Subscribe to us on YouTube: https://www.youtube.com/Magnet....BrainsEducation?sub_
➡️ Facebook : https://www.facebook.com/groups/MagnetBrains/

Paul Andersen explains how populations eventually reach a carrying capacity in logistic growth. He begins with a brief discussion of population size ( N ), growth rate ( r ) and exponential growth. He then explains how density dependent limiting factors eventually decrease the growth rate until a population reaches a carrying capacity ( K ). A mathematical simulation of this process is included along with a brief discussion of r and K selected species.

Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: http://www.freesound.org/peopl....e/CosmicD/sounds/725
Creative Commons Atribution License

All images are either Public Domain or Creative Commons Attribution Licenses:
"File:Frog in Frogspawn.jpg." Wikipedia, the Free Encyclopedia. Accessed April 19, 2013. http://en.wikipedia.org/wiki/F....ile:Frog_in_frogspaw
"File:Stress-coloured Brookesia Desperata Female with Two Recently Laid Eggs.png." Wikipedia, the Free Encyclopedia. Accessed April 19, 2013. http://en.wikipedia.org/wiki/F....ile:Stress-coloured_
Nevit. English: White Rabbit, 2011. Own work. https://commons.wikimedia.org/....wiki/File:Rabbit_nev

Follow updates on Twitter: https://twitter.com/eigensteve

This video discusses how all exponential growth eventually tapers off, through one mechanism or another.

Website: https://www.eigensteve.com/

Exponential Growth

Paul Andersen explains how populations experience exponential. He begins by address the major players; N (population size) and r (growth rate). He models population growth in rabbits through four generations. He then shows you how to use a spreadsheet and then algebra to predict future populations.


Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: http://www.freesound.org/peopl....e/CosmicD/sounds/725
Creative Commons Atribution License

All images are either Public Domain or Creative Commons Attribution Licenses:
Nevit. English: White Rabbit, 2011. Own work. https://commons.wikimedia.org/....wiki/File:Rabbit_nev

This algebra and precalculus video tutorial explains how to solve exponential growth and decay word problems. It provides the formulas and equations / functions that you need to solve it. This video contains plenty of examples and practice problems.

My Website: https://www.video-tutor.net
Patreon Donations: https://www.patreon.com/MathScienceTutor
Amazon Store: https://www.amazon.com/shop/th....eorganicchemistrytut

Here is a list of example problems.
1. Population Growth of Rabbits on an island
2. Depreciation of car value
3. Appreciation of Home value
4. Exponential Growth Bacteria Problem - Finding how much will there if the bacteria doubles or triples every 20 minutes