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Why Is Blood Red?

Thu, 10 Apr 2025 22:06:12 +0000

It’s a question that's been pondered for centuries. It's such an obvious question, in fact, that it barely even seems worth asking anymore. But it is worth asking! And the answer is actually pretty interesting. So let's get into it!
The quick and simple answer is that blood absorbs green light and reflects red light. As a result, it appears red to your eye.
This means that the reason why the blood looks red is because of how light is reflected through our body!

Blood is red because of hemoglobin, a protein molecule that contains iron. When the oxygen in your blood comes in contact with this iron and binds to it, it gives off a reddish color.
Hemoglobin helps transport oxygen throughout the body through arteries and veins. Hemoglobin is what gives blood its dark red color. Red light can't pass through a water molecule because of its electric charge, but green light can: it reflects off the surface of water molecules instead of being absorbed by them. That’s why if you’ve ever dived down deep in the sea, you’ll notice that reds quickly disappear, but greens can still be seen clearly.
The amount of red light can change with temperature too though.
Hemoglobin absorbs light energy (also known as photons) and converts it into heat energy instead. When there's more hemoglobin present than necessary, those extra photons are absorbed by free electrons in other molecules within our cells; this leads to higher temperatures and eventually causes overheating if conditions get too extreme (like on hot summer days). On the flip side, when there isn't enough hemoglobin available for this process due to insufficient oxygen levels or injuries like cuts from sharp objects like knives--it results in a blue discoloration because not enough light is getting through due an absence or deficiency of iron-containing proteins such as myoglobin.

So next time you hear someone tell you that blood is actually blue when it doesn’t have enough oxygen, you can tell them that they’re wrong, and that the blood is always red, but that the colour we see depends on a number of factors, including how much hemoglobin there is in the blood, how much light there is, the colour of the light, and even the temperature.

How to Speak

Sat, 25 May 2024 02:25:40 +0000

MIT How to Speak, IAP 2018
Instructor: Patrick Winston
View the complete course: https://ocw.mit.edu/how_to_speak

Patrick Winston's How to Speak talk has been an MIT tradition for over 40 years. Offered every January, the talk is intended to improve your speaking ability in critical situations by teaching you a few heuristic rules.

0:16 Introduction
3:11 Rules of Engagement
4:15 How to Start
5:38 Four Sample Heuristics
10:17 The Tools: Time and Place
13:24 The Tools: Boards, Props, and Slides
36:30 Informing: Promise, Inspiration, How To Think
41:30 Persuading: Oral Exams, Job Talks, Getting Famous
53:06 How to Stop: Final Slide, Final Words
56:35 Final Words: Joke, Thank You, Examples

This video has been dubbed using an artificial voice via https://aloud.area120.google.com to increase accessibility.

License: Creative Commons BY-NC-SA
More information at https://ocw.mit.edu/terms
More courses at https://ocw.mit.edu

The One Question You Need to Understand Who You Are

Mon, 13 May 2024 18:17:23 +0000

There is one question that, perhaps more than any other, gets to the root of who we are and what motivates us: “What did I need to do in childhood to win the support and approval of my parents?” We might - to sharpen the picture - need to lean on a few subsidiary enquiries…

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“There is one question that, perhaps more than any other, gets to the root of who we are and what motivates us:

What did I need to do in childhood to win the support and approval of my parents?

We might - to sharpen the picture - need to lean on a few subsidiary enquiries:

To please my father, I needed to…
To please my mother, I needed to…

Not to upset my mother, I needed to…
Not to upset my father, I needed to…

Whatever might be claimed, no family ever gives its offspring unconditional love; there is always, more or less subtly, something that one has to do and to be - and other things that must at all costs be skirted…”

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CREDITS

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Deanca Rensyta
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Title animation produced in collaboration with

Graeme Probert
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How to practice effectively...for just about anything - Annie Bosler and Don Greene

Sun, 12 May 2024 01:07:58 +0000

View full lesson: http://ed.ted.com/lessons/how-....to-practice-effectiv

Mastering any physical skill takes practice. Practice is the repetition of an action with the goal of improvement, and it helps us perform with more ease, speed, and confidence. But what does practice actually do to make us better at things? Annie Bosler and Don Greene explain how practice affects the inner workings of our brains.

Lesson by Annie Bosler and Don Greene, animation by Martina Meštrović.

A Test to Judge How Good Your Parents Were

Fri, 03 May 2024 20:12:44 +0000

Having had a good enough parent is a vital component of mental health in adulthood. But what really is a good enough parent? How can one tell if one had one or not? This film guides us as to what might have gone very right - and sometimes very wrong - in our childhoods.
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"Strangely, and rather awkwardly, it seems no human being can ever really grow up sane unless it has been loved very deeply by someone for a number of years in its early life. But we’re still learning what parental love might actually involve. The word ‘love’ trips lightly off the tongue and few parents – even the most disagreeable ones – would ever resist a claim that they felt the emotion deeply, but that doesn’t mean that loving behaviour is any easier to understand in theory or practice in reality… "

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The True Cause of Obsessive Thinking

Fri, 03 May 2024 20:11:20 +0000

We all are, at times, the victims of one of the cruellest and most remorseless of all mental afflictions: obsessive thinking. But why?

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You can read more on this and other subjects here: https://9qq0.short.gy/m0b8dK

“For some of us, today like every day, will mean another case of immersing ourselves, from the moment we wake up, in a by-now very familiar set of painful thoughts. We will dwell – once again – on how awful we look and more particularly, on how our nose is repulsively proportioned relative to the rest of our face. We will think – once again – of a website we inadvertently visited twelve years ago and how the police might be preparing to close in on, and arrest, us. We will think – once again – of how several of our neighbours (especially the people upstairs) might be colluding to ruin and disgrace us. Or we will think – once again – of something we said to a colleague which we fear they misconstrued and which may well lead them to seek disciplinary action against us at any moment…”

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CREDITS

Produced in collaboration with:

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Title animation produced in collaboration with

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PHILOSOPHY - Aristotle

Wed, 01 May 2024 07:30:52 +0000

Aristotle was the master of virtues.

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“Aristotle was born around 384 BC in the ancient Greek kingdom of Macedonia, where his father was the royal doctor. He grew up to be arguably the most influential philosopher ever, with modest nicknames like ‘the master’, and simply ‘the philosopher’. One of his big jobs was tutoring Alexander the Great, who soon after went out and conquered the known world...”

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What's Education For?

Wed, 01 May 2024 07:18:37 +0000

The greatest problem of the modern education system is that it doesn't focus on systematically preparing students for many aspects of the real challenge out there: Life itself.

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Make Body Language Your Superpower

Fri, 19 Apr 2024 01:24:00 +0000

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

15 Psychological Facts That Will Blow Your Mind

Wed, 17 Apr 2024 06:12:26 +0000

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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What The Ultimate Study On Happiness Reveals

Wed, 17 Apr 2024 06:05:36 +0000

How to lead a happier, healthier and longer life. Check out our sponsor: https://betterhelp.com/veritasium to get matched with a professional therapist who will listen and help.

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A huge thanks to Prof. Robert Waldinger for all his help with this video.

To learn more about what makes for a good life, visit: https://the-good-life-book.com/ and https://www.youtube.com/watch?v=8KkKuTCFvzI&pp=ygUJd2FsZGluZ2Vy

A special thanks to Prof. Julianne Holt-Lunstad for her expert advice on the importance of social connections and the detrimental effects of loneliness and social isolation.

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Additional Videos:
Family Reacts to Winning CA$1 Million Lotto, NowThisNews via YouTube - https://ve42.co/CA1Lottery

Woman claims to be $1 billion Powerball winner, KTLA 5 via YouTube - https://ve42.co/1BilLottery

Old Lottery Winner Meets Young Lottery Winner | The Gap, LADbible TV via YouTube - https://ve42.co/LADBibleLottery

Why eyewitnesses get it wrong - Scott Fraser, TED-Ed via Youtube - https://ve42.co/TEDFraser

Surgeon General discusses health risks of loneliness and steps to help connect with others, PBS NewsHour via YouTube - https://ve42.co/PBS-SG

▀▀▀
References:
Waldinger, R., & Schulz, M. (2023). The Good Life: Lessons from the World's Longest Scientific Study of Happiness. Simon and Schuster.

Lindqvist et al. (2020). Long-run effects of lottery wealth on psychological well-being. The Review of Economic Studies. - https://ve42.co/Lindqvist2020

Wen et al. (2011). Minimum amount of physical activity for reduced mortality and extended life expectancy: a prospective cohort study. The lancet. - https://ve42.co/Wen2011

Nocon et al. (2008). Association of physical activity with all-cause and cardiovascular mortality: a systematic review and meta-analysis. European Journal of Preventive Cardiology. - https://ve42.co/Nocon2008

Blondell et al. (2014). Does physical activity prevent cognitive decline and dementia?: A systematic review and meta-analysis of longitudinal studies. BMC public health. - https://ve42.co/Blondell2014

Office of the Surgeon General. (2023). Our Epidemic of Loneliness and Isolation: The US Surgeon General’s Advisory on the Healing Effects of Social Connection and Community. - https://ve42.co/LonelinessEpidemic

Holt-Lunstad et al. (2010). Social relationships and mortality risk: a meta-analytic review. PLoS medicine. - https://ve42.co/Holt-Lunstad2010

Valtorta et al. (2016). Loneliness and social isolation as risk factors for coronary heart disease and stroke: systematic review and meta-analysis of longitudinal observational studies. Heart. -
https://ve42.co/Valtorta2016

Shovestul et al. (2020). Risk factors for loneliness: The high relative importance of age versus other factors. PloS one. - https://ve42.co/Shovestul2020

Donovan et al. (2017). Loneliness, depression and cognitive function in older US adults. International journal of geriatric psychiatry. - https://ve42.co/Donovan2017

Lara et al. (2019). Does loneliness contribute to mild cognitive impairment and dementia? A systematic review and meta-analysis of longitudinal studies. Ageing research reviews. - https://ve42.co/Lara2019

Holt-Lunstad et al. (2015). Loneliness and social isolation as risk factors for mortality: a meta-analytic review. Perspectives on psychological science. - https://ve42.co/Holt-Lunstad2015

McIntyre et al. (2015). Compulsive Internet use and relations between social connectedness, and introversion. Computers in Human Behavior. - https://ve42.co/McIntyre2015

Kahneman & Deaton. (2010). High income improves evaluation of life but not emotional well-being. Proceedings of the national academy of sciences. - https://ve42.co/Kahneman2010

Killingsworth. (2021). Experienced well-being rises with income, even above $75,000 per year. Proceedings of the National Academy of Sciences. - https://ve42.co/Killingsworth2021

Killingsworth et al. (2023). Income and emotional well-being: A conflict resolved. Proceedings of the National Academy of Sciences. - https://ve42.co/Killingsworth2023

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Intro to Psychology: Crash Course Psychology #1

Wed, 17 Apr 2024 05:48:53 +0000

What does Psychology mean? Where does it come from? Hank gives you a 10-minute intro to one of the more tricky sciences and talks about some of the big names in the development of the field. Welcome to Crash Course Psychology!!!

Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych!

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Chapters:
Introduction: What is Psychology? 00:00
Early Thinkers in Psychology 0:46
Big Questions in Psychology 1:31
Sigmund Freud 2:21
Disciplines of Psychology 3:02
Structuralism 3:29
Functionalism 4:28
Psychoanalysis 4:58
Freud's Death & Legacy 7:01
Behaviorism 7:51
Psychodynamic Theories 8:21
Other Disciplines in Psychology 8:37
Credits 10:09

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PHILOSOPHY - Michel Foucault

Mon, 15 Apr 2024 07:03:32 +0000

Michel Foucault was a philosophical historian who questioned many of our assumptions about how much better the world is today compared with the past. When he looked at the treatment of the mad, at the medical profession and at sexuality, he didn't see the progress that's routinely assumed.

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“Michel Foucault (1926-1984) was a French 20th-century philosopher and historian who spent his career forensically critiquing the power of the modern bourgeois capitalist state, including its police, law courts, prisons, doctors and psychiatrists. His goal was to work out nothing less than how power worked and then to change it in the direction of a Marxist-anarchist utopia. Though he spent most of his life in libraries and seminar rooms, he was a committedly revolutionary figure, who met with enormous popularity in elite Parisian intellectual circles (Jean Paul Sartre admired him deeply) and still maintains a wide following among young people studying at university in the prosperous corners of the world…”

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The philosophy of Stoicism - Massimo Pigliucci

Mon, 15 Apr 2024 07:00:43 +0000

View full lesson: http://ed.ted.com/lessons/the-....philosophy-of-stoici

What is the best life we can live? How can we cope with whatever the universe throws at us and keep thriving nonetheless? The ancient Greco-Roman philosophy of Stoicism explains that while we may not always have control over the events affecting us, we can have control over how we approach things. Massimo Pigliucci describes the philosophy of Stoicism.

Lesson by Massimo Pigliucci, animation by Compote Collective.