Body language, both the speaker's and the audience's, is a powerful form of communication that is difficult to master, especially if the speaker is nervous. This video will teach you how to use your body language effectively, read the audience's body language and what to do when they look bored or disconnected. Use these tools to enhance your nonverbal communication abilities and better connect with your audiences.
Presented by Stanford graduate students Matt Levy, Colin Bailie, Jeong Joon Ha, and Jennifer Rosenfeld. Created as an exemplary final project in Lecturer JD Schramm's Strategic Communication course. Learn more about communication techniques and best practices on "Think Fast, Talk Smart: The Podcast." https://www.gsb.stanford.edu/i....nsights/think-fast-t

Adding Fractions?
Subtracting Fractions?
Multiplying Fractions?
Dividing Fractions?
Mixed Numbers?
Simplifying Fractions?

It's all here.

To support tecmath on Patreon: https://www.patreon.com/tecmath
It really helps and is appreciated!

Not everything that is true can be proven. This discovery transformed infinity, changed the course of a world war and led to the modern computer. This video is sponsored by Brilliant. The first 200 people to sign up via https://brilliant.org/veritasium get 20% off a yearly subscription.

Special thanks to Prof. Asaf Karagila for consultation on set theory and specific rewrites, to Prof. Alex Kontorovich for reviews of earlier drafts, Prof. Toby ‘Qubit’ Cubitt for the help with the spectral gap, to Henry Reich for the helpful feedback and comments on the video.

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References:

Dunham, W. (2013, July). A Note on the Origin of the Twin Prime Conjecture. In Notices of the International Congress of Chinese Mathematicians (Vol. 1, No. 1, pp. 63-65). International Press of Boston. — https://ve42.co/Dunham2013

Conway, J. (1970). The game of life. Scientific American, 223(4), 4. — https://ve42.co/Conway1970

Churchill, A., Biderman, S., Herrick, A. (2019). Magic: The Gathering is Turing Complete. ArXiv. — https://ve42.co/Churchill2019

Gaifman, H. (2006). Naming and Diagonalization, from Cantor to Godel to Kleene. Logic Journal of the IGPL, 14(5), 709-728. — https://ve42.co/Gaifman2006

Lénárt, I. (2010). Gauss, Bolyai, Lobachevsky–in General Education?(Hyperbolic Geometry as Part of the Mathematics Curriculum). In Proceedings of Bridges 2010: Mathematics, Music, Art, Architecture, Culture (pp. 223-230). Tessellations Publishing. — https://ve42.co/Lnrt2010

Attribution of Poincare’s quote, The Mathematical Intelligencer, vol. 13, no. 1, Winter 1991. — https://ve42.co/Poincare

Irvine, A. D., & Deutsch, H. (1995). Russell’s paradox. — https://ve42.co/Irvine1995

Gödel, K. (1992). On formally undecidable propositions of Principia Mathematica and related systems. Courier Corporation. — https://ve42.co/Godel1931

Russell, B., & Whitehead, A. (1973). Principia Mathematica [PM], vol I, 1910, vol. II, 1912, vol III, 1913, vol. I, 1925, vol II & III, 1927, Paperback Edition to* 56. Cambridge UP. — https://ve42.co/Russel1910

Gödel, K. (1986). Kurt Gödel: Collected Works: Volume I: Publications 1929-1936 (Vol. 1). Oxford University Press, USA. — https://ve42.co/Godel1986

Cubitt, T. S., Perez-Garcia, D., & Wolf, M. M. (2015). Undecidability of the spectral gap. Nature, 528(7581), 207-211. — https://ve42.co/Cubitt2015

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Sewing machines are mechanical marvels – here’s how they work. Get your first month of KiwiCo FREE at https://www.kiwico.com/veritasium

If you’re looking for a molecular modeling kit, head to https://ve42.co/SnatomsV to try Snatoms – a kit I invented where the atoms snap together magnetically.

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A huge thanks to Prof. Andy Ruina for suggesting this video topic, guiding us in the research, and giving deeply insightful notes.

Massive thanks to Noah Johnson and Tina Vines for teaching Derek how to chain-stitch, and letting us shoot with your embroidery machine! Please check out https://www.instagram.com/stitchrite and https://www.instagram.com/tina_vines if you're interested in seeing more of their gorgeous chain stitch embroidery.

Thanks to Denny Stanley and the whole crew at Las Vegas Props for building the large replica model of the sewing machine. https://www.vegasprops.net

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References:
Parton, J. (1870). History of the Sewing-machine. Howe Machine Company, No. 38, N. Charles St.. -- https://ve42.co/Patron1870

Gregory, J. M. (2006). A History of the Sewing Machine to 1880. Transactions of the Newcomen Society, 76(1), 127-144. -- https://ve42.co/Gregory2006

How America Spends Money: 100 Years In the Life of the Family Budget, The Atlantic -- https://ve42.co/Budget1

Buckman, J. (2016). Unraveling the Threads: The Life, Death and Resurrection of the Singer Sewing Machine Company, America’s First Multi-National Corporation. Dog Ear Publishing.

Lewton, F. L. (1930). The servant in the house: a brief history of the sewing machine (Vol. 3056). US Government Printing Office. -- https://ve42.co/Lewton1930

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The most famous equation in finance, the Black-Scholes/Merton equation, came from physics. It launched an industry worth trillions of dollars and led to the world’s best investments. Go to https://www.eightsleep.com/veritasium and use the code Veritasium for $200 off your Pod Cover.

Special thanks to our Patreon supporters! Join this list to help us keep our videos free, forever:
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If you’re looking for a molecular modeling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV

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A huge thank you to Prof. Andrew Lo (MIT) for speaking with us and helping with the script.

We would also like to thank the following:
Prof. Amanda Turner (University of Leeds)
Owen Maher (Electrify Video Partners)

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References:

The Man Who Solved the Market: How Jim Simons launched the quant revolution, Gregory Zuckerman. Penguin Publishing Group. - https://ve42.co/GZuckerman

The Physics of Finance: Predicting the Unpredictable: Can Science Beat the Market? James Owen Weatherall. Short Books. - https://ve42.co/FinancePhysics

The Statistical Mechanics of Financial Markets, J.Voigt. Springer. - https://ve42.co/Springer

Black, F., & Scholes, M. (1973). The pricing of options and corporate liabilities. Journal of political economy, 81(3), 637-654. - https://ve42.co/BlackScholes

Cornell, B. (2020). Medallion fund: The ultimate counterexample?. The Journal of Portfolio Management, 46(4), 156-159. - https://ve42.co/Medallion

Images & Video:
Ed Thorp on The Tim Ferris Show - https://www.youtube.com/watch?v=CNvz91Jyzbg
Jim Simons on TED - https://www.youtube.com/watch?v=U5kIdtMJGc8
Jim Simons on Numberphile - https://www.youtube.com/watch?v=QNznD9hMEh0

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Special thanks to our Patreon supporters:
Adam Foreman, Anton Ragin, Balkrishna Heroor, Bill Linder, Blake Byers, Burt Humburg, Chris Harper, Dave Kircher, David Johnston, Diffbot, Evgeny Skvortsov, Garrett Mueller, Gnare, I.H., John H. Austin, Jr. ,john kiehl, Josh Hibschman, Juan Benet, KeyWestr, Lee Redden, Marinus Kuivenhoven, Max Paladino, Meekay, meg noah, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Sam Lutfi, Stephen Wilcox, Tj Steyn, TTST, Ubiquity Ventures


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Written by Will Wood, Emily Zhang, Petr Lebedev and Derek Muller
Camera operation by Raquel Nuno
Additional research by Gregor Čavlović
Edited by Jack Saxon and Trenton Oliver
Animated by Fabio Albertelli, Jakub Misiek, Ivy Tello, David Szakaly and Will Wood
Produced by Will Wood, Han Evans and Derek Muller

Thumbnail by Ren Hurley
Additional video/photos supplied by Getty Images and Pond5
Music from Epidemic Sound

⁣Gain a comprehensive understanding of SEO strategy, covering key elements such as crafting effective strategies, creating actionable roadmaps, leveraging competitive advantages, and presenting your plans to secure support and buy-in.

Herein we have compiled some of the most interesting psychological facts that will blow your mind! Human psychology explores the mind and behavior, and while there’s still a lot that we don’t know, there are some fascinating and surprising study findings about the secrets of the mind.

This video provides insightful explanations to why yawns are contagious, why food tastes better when someone else makes it, why we unintentionally believe what we want to believe, and so much more!

These psychology facts will explain or confirm some of the things you observe in yourself and others!


OTHER VIDEOS TO WATCH:

7 Subconscious Mistakes Your Brain Makes Every Day:
https://www.youtube.com/watch?v=1tEBf_qMrMM

17 Interesting Facts About Love:
https://www.youtube.com/watch?v=FrZxarhJX5E

15 Amazing Facts About The Human Body:
https://www.youtube.com/watch?v=FxBlYh7Sg-E


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Millions of Americans are administered anesthesia each year. Since 1846, doctors have used a variety of drugs to make patients unconscious for surgery, but even though the medications have changed, there's one thing that remains the same— it works. But how exactly?

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Following is the transcript of the video:

Narrator: When you go to sleep, if I pinched you, you'd be up. If I shook you, you'd be up, right? But under anesthesia, I'm gonna pinch you and do a full operation and you're not up. So it's really further on the spectrum of unconsciousness.

Narrator: When you wake up after being put under with general anesthesia you barely feel like any time has passed. You could have been out for an hour or a day and you wouldn't know the difference.

Fong: When you go to a natural sleep, people call your name, your alarm goes off, you wake up, right? This is not what is gonna happen during general anesthesia. You're gonna be unconscious.

Narrator: You're closer to being in a coma than being asleep.

Anesthesia was first used during surgery in 1846. The drug provided at that time was ether. Now anesthesiologists more commonly use a combination of drugs like propofol and fentanyl which interrupt neural pathways so you don't feel pain and you don't remember the surgery.

Fong: Three things that you need for general anesthesia are you need amnesia so that they don't remember, analgesia so they have pain relief and then operating conditions for the surgeon. Some surgeries you need the patient to be very relaxed so you would use a muscle relaxant. Other surgeries the patient just needs to be asleep and anesthetized but they don't need relaxation so how they do that varies upon the different medications that you're using. Some will depress excitatory neurons and some will enhance inhibitory neurons.

Narrator: Excitatory neurons, for example, get excited and send signals to other neurons to fire. Depressing them means less signals telling your brain you're in pain. Inhibitory neurons do the opposite. They make it harder for neurons to generate these electrical signals. In either case this means fewer active neurons overall which is important because when your body is being poked and prodded, neurons would typically fire to tell your brain you're in pain. If those neurons aren't firing, your brain doesn't know that your body is, well, being cut open.

Fong: Basically it interrupts the pathways and the communication between your neural networks. We're aiming for them to be not in pain by looking at their vital signs, their heart rate, their blood pressure. Then we want to make sure that they're unconscious.

Narrator: Without anesthesia, many important surgeries wouldn't be possible because they'd be way too traumatic.

Fong: Surgery didn't move forward, really, until anesthesia moved forward. You know, you watch those old movies. They give you a swig of alcohol, they put a tourniquet and they hack your leg off. People don't do well with that, right? If you had a bad heart, that would be the end of that.

Narrator: After the procedure is complete the doctors stop administering the meds and the most powerful effects of the drugs wear off but even though you're conscious again you might continue to experience some of the drugs side effects.

At $2 billion per aircraft, the Northrop B-2 Spirit is the most expensive plane ever built. But how does this giant become invisible to radar? And why does it look like it flew straight out of a sci-fi movie?

For more megaprojects content, be sure to subscribe to MegaBuilds!

0:00 The Insane Engineering of the B-2 Bomber
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11:50 The Cost & Future of the B-2

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Dr. Cal Newport and Dr. Andrew Huberman discuss the concept of time blocking, fixed schedule productivity and deep work.

Cal Newport, Ph.D. (@CalNewportMedia) is a professor of computer science at Georgetown University and bestselling author of numerous books on focus and productivity and how to access the deepest possible layers of your cognitive abilities in order to do quality work and lead a more balanced life. Dr. Andrew Huberman is a tenured professor of neurobiology and ophthalmology at Stanford University School of Medicine and host of the Huberman Lab podcast.

Watch the full episode: https://youtu.be/p4ZfkezDTXQ
Show notes: https://www.hubermanlab.com/ep....isode/dr-cal-newport

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Timestamps
00:00 Introduction to Time Management Strategies
00:11 The Philosophy of Time Blocking vs. To-Do Lists
01:31 Adopting a Fixed Schedule for Productivity
02:17 Incorporating Exercise into a Busy Schedule
03:30 Managing Insomnia and Productivity
06:41 Deep Work: The Key to Long-Term Success
07:54 Looking Ahead: Planning for Decades, Not Days
08:51 Conclusion and Invitation to Watch Full Episode

#hubermanlab #calnewport #productivity the Huberman Lab podcast is for general informational purposes only and does not constitute the practice of medicine, nursing or other professional health care services, including the giving of medical advice, and no doctor/patient relationship is formed. The use of information on this podcast or materials linked from this podcast is at the user’s own risk. The content of this podcast is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Users should not disregard or delay in obtaining medical advice for any medical condition they may have and should seek the assistance of their health care professionals for any such conditions.

Want my books for free? Go here: https://www.acquisition.com/audiobooks
The easiest business I can help you start (free trial): https://www.skool.com/games

If you’re new to my channel, my name is Alex Hormozi. I’m the founder and managing partner of Acquisition.com. It’s a family office, which is just a formal way of saying we invest our own money into companies. Our 10 portfolio companies bring in over $250,000,000+ per year. Our ownership stake varies between 20% and 100% of them. Given this is a YT channel, and anyone can claim anything, I’ll give you some stuff you can google to verify below.

How I got here…

21: Graduated Vanderbilt in 3 years Magna Cum Laude, and took a fancy consulting job.
23 yrs old: Left my fancy consulting job to start a business (a gym).
24 yrs old: Opened 5 gym locations.
26 yrs old: Closed down 6th gym. Lost everything.
26 yrs old: Got back to launching gyms (launched 33). Then, lost everything for a 2nd time.
26 yrs old: In desperation, started licensing model as a hail mary. It worked.
27 yrs old: "Gym Launch" does $3M profit the next 6 months. Then $17M profit next 12 months.
28 yrs old: Started Prestige Labs. $20M the first year.
29 yrs old: Launched ALAN, a software company for agencies to work leads for customers. Scaled to $1.7mmo within 6 months.
31 yrs old: Sold 75% of UseAlan to a strategic buyer in an all stock deal.
31 yrs old: Sold 66% of Gym Launch & Prestige Labs at $46.2M valuation in all-cash deal to American Pacific Group. (you can google it)
31 yrs old: Started our family office Acquisition.com. We invest and scale companies using the $42M in distributions we had taken + the cash from the $46.2M exit.
32 yrs old: Started making free content showing how we grow companies to make real business education accessible to everyone (and) to attract business owners to invest or scale their businesses.
34 yrs old: I became co-owner of https://Skool.com to help the many people who want to start a business online do so.

Today: Our portfolio now does $200M/yr between 10 companies. The largest doing $100M/yr the smallest doing $5M per year. Our ownership varies between 20% and 100% ownership of the companies. Many of them we invested in early and helped grow (which is how we make our money - not youtube videos).

To all the gladiators in the arena, we’re all in the middle of writing our own stories. The worse the monsters, the more epic the story.

You either get an epic outcome or an epic story. Both mean you win.

Keep crushing. May your desires be greater than your obstacles.

Never quit,

Alex

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Does light take all possible paths at the same time



We’re incredibly grateful to Prof. David Kaiser, Prof. Steven Strogatz, Prof. Geraint F. Lewis, Elba Alonso-Monsalve, Prof. Christopher S. Baird, Prof. Anthony Bloch, and Prof. Stephen Bartlett for their invaluable contributions to this video.

A special thanks to Mahesh Shenoy from FloatHeadPhysics for his help with this video. Check out his excellent intuitive video on the UV Catastrophe here (Sep 2024): https://www.youtube.com/watch?v=ALEDjjAVZSY

▀▀▀
0:00 What path does light travel?
2:40 Black Body Radiation
6:47 How did Planck solve the ultraviolet catastrophe?
9:42 The Quantum of Action
13:25 De Broglie’s Hypothesis
15:16 The Double Slit Experiment
20:00 How Feynman Did Quantum Mechanics
25:01 Proof That Light Takes Every Path
31:16 The Theory of Everything

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Sign up to our Patreon to watch the Q&A for free: https://www.patreon.com/c/veritasium

Try Snatoms! A molecular modelling kit I invented where the atoms snap together.
https://ve42.co/SnatomsV

▀▀▀
References:
Armin Hermann (Nov 1974). The Genesis of Quantum Theory (1899-1913). - https://ve42.co/genquanttheor
Richard P. Feynman (1985). QED The Strange Theory of Light and Matter. - https://ve42.co/qed
A fantastic book on the history of the Principle of Least Action: Rojo, A. and Bloch, A. The
Principle of Least Action: History and Physics. - https://ve42.co/Bloch2018
Coopersmith, J. (2017). The lazy universe: an introduction to the principle of least action. Oxford University Press. - https://ve42.co/LazyU
PBS Space Time. (Nov 2021) - https://www.youtube.com/watch?v=Q_CQDSlmboA
Sabine Hossenfelder. (May 2022) - https://www.youtube.com/watch?v=A0da8TEeaeE
Max Planck (1901). On the Law of Distribution of Energy in the Normal Spectrum. Annalen der Physik - https://ve42.co/lawdistenergy
Paul Ehrenfest (1911). Welche Züge der Lichtquantenhypothese spielen in der Theorie der Wärmestrahlung eine wesentliche Rolle?. Wiley Online Library - https://ve42.co/quantthermrad
Nils-Erik Bomark and Reidun Renstrøm (Aug 2023). The Ultraviolet myth. Proceedings of Science - https://ve42.co/uvmyth
Planck's law. In Wikipedia - https://ve42.co/planckslaw
PBS Space Time. (Jul 2017). - https://www.youtube.com/watch?v=vSFRN-ymfgE&t=10s
Einstein and The Photoelectric Effect. (Jan 2005) via APS News - https://ve42.co/einsteinphotoelec
Louis de Broglie (1924). On the Theory of Quanta. - https://ve42.co/theoryquanta
Larry Sorensen (2012). Path Integrals 1. University of Washington - https://ve42.co/pathintegrals
Feynman’s Method of “A Particle Exploring All Possible Paths”. (Mar 2018) via Pure Dhamma - https://ve42.co/allposspaths
A great intuitive video on the Feynman path integral approach - https://www.youtube.com/watch?v=Sp5SvdDh2u8&t=1253s
Origins of Quantum Theory. via University of Pittsburgh - https://ve42.co/origquanttheor

Images & Video:
Nobistor Altona 1880 via NDR - https://ve42.co/streetlight
Edison incandescent lights by William J. Hammer via Wikimedia Commons - https://ve42.co/edinclights
The full expanded form of the Standard Model Lagrangian by Chen Ning Yang et al. via Wikipedia - https://ve42.co/stmodellang
Muon Ray. (2011). https://www.youtube.com/watch?v=-QUj2ZRUa7c
Muon Ray. (2011). https://www.youtube.com/watch?v=1C7abO7LtV0
Bohrs Atomic Model via EEEGUIDE.COM - https://ve42.co/bohrmodel

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Directed by Casper Mebius
Written by Casper Mebius and Derek Muller
Edited by Trenton Oliver and Peter Nelson
Animated by Fabio Albertelli, Mike Radjabov, Ivy Tello, Andrew Neet and Emma Wright
Illustrations by Jakub Misiek, Tommy A. Steven and Cainejan Esperanza
Filmed by Derek Muller and Casper Mebius
Produced by Casper Mebius, Derek Muller, Rob Beasley Spence, Gabe Strong, Geeta Thakur, Emilia Gyles, Zoe Heron, Emily Zhang and Tori Brittain

Thumbnail contributions by Ignat Berbeci, Ben Powell, Jakub Misiek, Ren Hurley, and Peter Sheppard

Additional video/photos supplied by Getty Images and Storyblocks
Music from Epidemic Sound