One man cracked his knuckles in one hand for 60 years and not the other. Watch the video to see what he found out.

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There's a long-held myth that cracking your knuckles can damage your hands. The sound definitely might make people around you cringe, but what's making those noises, and is it actually bad for you?

There's a space in your joints filled with synovial fluid, a liquid that reduces the friction in your joints when you move. It contains gases (oxygen, nitrogen, and carbon dioxide).

When you pop a joint, you stretch out that space between the bones. That expanding space creates negative pressure, like a vacuum, that sucks in the synovial fluid. It forms bubbles, which then collapse, and that's what you hear.

Most medical sources agree that unless you experience pain when you pop your joints, you're probably fine to keep doing it. Researchers (including one man who cracked his knuckles on just one hand for 60 years) haven't established a connection between cracking your knuckles and arthritis.

One 1990 study of 300 people did find that cracking knuckles over a long period of time led to hand swelling and decreased grip strength, but there hasn't been any follow-up research on that.

Read it here: https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC10040

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ALL OF PHYSICS in 14 Minutes: https://youtu.be/ZAqIoDhornk

Everything is made of atoms. Chemistry is the study of how they interact, and is known to be confusing, difficult, complicated...let's learn General Chemistry in under 20 Minutes.

This is not ALL of Chemistry, as fields like "Organic Chemistry" deserve videos of their own. But, this is the foundation, or "General Chemistry", which contains most concepts you need to know to understand other topics and fields of Chemistry.

This is a summary and revision of around 4 years of Chemistry you learn in school, with maybe some university level concepts sprinkled in the mix.
This video is a good summary for preparing for exams and finals. Maybe. Perhaps.

Now go learn all of Chemistry. And share this with your friends who suck at Chemistry

Timestamps:
00:00 Intro
00:16 Valence Electrons
00:34 Periodic Table
01:24 Isotopes
01:34 Ions
01:47 How to read the Periodic Table
02:09 Molecules & Compounds
02:27 Molecular Formula & Isomers
02:53 Lewis-Dot-Structures
03:03 Why atoms bond
03:26 Covalent Bonds
03:37 Electronegativity
03:54 Ionic Bonds & Salts
04:25 Metallic Bonds
04:59 Polarity
05:37 Intermolecular Forces
05:51 Hydrogen Bonds
06:00 Van der Waals Forces
06:20 Solubility
06:46 Surfactants
07:00 Forces ranked by Strength
07:07 States of Matter
07:28 Temperature & Entropy
07:49 Melting Points
08:01 Plasma & Emission Spectrum
08:35 Mixtures
09:24 Types of Chemical Reactions
09:45 Stoichiometry & Balancing Equations
10:16 The Mole
10:46 Physical vs Chemical Change
11:05 Activation Energy & Catalysts
11:24 Reaction Energy & Enthalpy
11:42 Gibbs Free Energy
12:50 Chemical Equilibriums
13:15 Acid-Base Chemistry
13:41 Acidity, Basicity, pH & pOH
14:43 Neutralisation Reactions
14:56 Redox Reactions
15:18 Oxidation Numbers
16:01 Quantum Chemistry

Music by Audionautix.com

You deserve better than Shein.

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There are countless articles and videos breaking down the abysmal labor practices, horrifying environmental toll, and overall mountain of waste produced by the fast fashion industry. Activists and even just large swaths of the general public have been raising the alarm about this for well over a decade, but it hasn’t stopped the rise of some of the worst offenders in the industry. For example, the ultra-fast fashion brand Shein has skyrocketed in value over the past five years largely due to their marketing success on TikTok. A lot of us know that fast fashion is bad, but the only way companies like Shein still thrive is if we convince ourselves otherwise and hit “add to cart” anyway. So why do we do it?

The answer is that e-commerce has completely warped our view of what items should cost and how long they should last (this includes and extends to our obsession with Amazon and two-day shipping). We’re moving through trends at an unprecedented pace and it’s doomed to get worse if we don’t adjust our buying habits and learn to slow down. Consumers are being manipulated, but we can do better.

Watch the video above to learn more, and don’t forget to check out the Vox article by Izzie Ramirez: https://www.vox.com/even-bette....r/2023/11/14/2395567

You can also watch the sister video to this one from last year on why everything is worse now:
https://youtu.be/DHXBacEH0qo?si=wft1yGpeqbdcv1Vq

Help keep Vox free for everybody: http://www.vox.com/give-now

Sources and further reading:

Related Vox articles:
https://www.vox.com/the-goods/....2020/2/3/21080364/fa
https://www.vox.com/the-goods/....2021/7/19/22535050/g
https://www.vox.com/even-bette....r/2023/11/14/2395567
https://www.vox.com/the-goods/....23529587/consumer-go
https://www.vox.com/2019/9/12/....20860620/fast-fashio
https://www.vox.com/the-goods/....2020/1/27/21080107/f

Fashion transparency index: https://www.fashionrevolution.....org/about/transparen
The state of fashion: https://cdn.businessoffashion.....com/reports/The_Stat
More on the psychology of fast fashion: https://www.thesustainablefash....ionforum.com/pages/t

More on the environmental toll:
https://earth.org/fast-fashion....s-detrimental-effect
https://psci.princeton.edu/tip....s/2020/7/20/the-impa
https://www.unep.org/news-and-....stories/story/enviro
https://www.biologicaldiversit....y.org/programs/popul

You can find Cora’s book and blog here: https://www.thelingerieaddict.....com/in-intimate-deta

Video tags:
Fast fashion, fashion, waste, environment, shein, temu, h&m, zara, asos, tiktok, trends, trend cycles, consumers, consumerism, buying, clothing, pollution, runway, labor practices, unethical, hauls, shein haul, gen z, human rights, consumer goods, quality, brands, transparency, misinformation, uniqlo, trendy, cheap, inexpensive, true cost, cost, price, social media, e-commerce, greenwashing, even better, advice, service

In this animated video, Dr Hadzic share the three most common reasons why IV access fail. In Based on 3 decades of teaching and medical education, he has witnessed these three fundamental mistakes that are basis of most failures to secure an IV access. 1) The catheter is too short 2) The needle and catheter not inserted deep enough into the vein 3) The angle of needle insertion is too steep.

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#nysora #regionalanesthesia #anesthesia disclaimer:
Medicine is an ever-changing science. As new research and clinical experience broaden, changes in treatment and drug therapy are required. The authors and publishers have checked with sources believed to be reliable in efforts to provide accurate information within the available or accepted standards of care. However, given the possibility of human error or changes in medical practice, neither the authors nor the publisher, nor any other party involved in the preparation of this platform warrants that the information contained herein is in every aspect accurate or complete, and they disclaim all responsibility for any errors or omissions for the results obtained from the use of the information contained in this work. Readers are advised to confirm the information contained herein with other sources. For example, readers are advised to check the product information of each drug mentioned, and that any information contained on NYSORA's Youtube channel is accurate.

Matt Abrahams is a lecturer of strategic communication at Stanford GSB and the host of the award-winning podcast "Think Fast, Talk Smart," a show with research-backed techniques becoming a more confident communicator.

Communication is critical to success in business and in life. Concerned about an upcoming interview? Anxious about speaking up during a meeting? In this talk, and through the podcast, you will learn techniques that will help you speak with greater confidence and clarity.

This video was recorded on October 25, 2014, in collaboration with the Stanford Alumni Association as part of Stanford Reunion Homecoming and the Graduate School of Business Fall Reunion/Alumni Weekend.