What is inside a hair dryer? (2 of 2) | Electrical engineering | Khan Academy

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In this video we explore what is inside a hairdryer, how it is made, and how it works. Created by Karl Wendt.

Watch the next lesson: https://www.khanacademy.org/science/electrical-engineering/reverse-engin/hair-dryer/v/compare-motors?utm_source=YT&utm_medium=Desc&utm_campaign=electricalengineering

Missed the previous lesson? https://www.khanacademy.org/science/electrical-engineering/reverse-engin/hair-dryer/v/what-is-inside-a-hairdryer-1-of-2?utm_source=YT&utm_medium=Desc&utm_campaign=electricalengineering

Electrical engineering on Khan Academy: A summary of the math and science preparation that will help you have the best experience with electrical engineering taught on Khan Academy. Become familiar with engineering numbers and notation, and learn about the two most important electrical quantities: current and voltage.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We’ve also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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Dimorphism: Definition, Types, and Examples

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Video shows what sexual dimorphism means. A physical difference between male and female individuals of the same species.. Sexual dimorphism Meaning. How to pronounce, definition audio dictionary. How to say sexual dimorphism. Powered by MaryTTS, Wiktionary
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What is sexual dimorphism?

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What is sexual dimorphism?
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Chow Chow Shave Extremely Matted

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Chow Chow Dog Grooming #Shorts

Why are Rich People Overconfident? How Social Class Influences Behavior

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Parasite, Knives Out and Us all are rooted in the theme of classism.

To break that down and inspire a larger conversation, we turned to the internet to find an article to frame our first discussion.

According to research published by the American Psychological Association, people who see themselves as being in a higher social class may tend to have an exaggerated belief that they are more adept than their equally capable lower-class counterparts and that overconfidence can often be misinterpreted by others as greater competence in important situations, such as job interviews.

Our panel of Shrinks are discussing this and more in our segment of psychology in the news that we call Being Human.

Read the study that inspired our discussion here:
https://www.sciencedaily.com/releases/2019/05/190520093452.htm

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ਕੋਟਕਪੂਰੇ ਦੇ ਢੋਡੇ ਜਿੰਨਾ ਮਸ਼ਹੂਰ ਹੋਵੇਗਾ ਇਹ ਮੁੰਡਾ l Chandra Brar l Gurdeep Kaur Grewal l B Social

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ਕੋਟਕਪੂਰੇ ਦੇ ਢੋਡੇ ਜਿੰਨਾ ਮਸ਼ਹੂਰ ਹੋਵੇਗਾ ਇਹ ਮੁੰਡਾ l Chandra Brar l Gurdeep Kaur Grewal l B Social

ਕੋਟਕਪੂਰੇ ਦੇ ਢੋਡੇ ਜਿੰਨਾ ਮਸ਼ਹੂਰ ਹੋਵੇਗਾ ਇਹ ਮੁੰਡਾ l Interview with Chandra Brar l Gurdeep Kaur Grewal l B Social

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DES PUADH : ਦਵਾਈਆਂ ਕਿਸੇ ਨੂੰ ਠੀਕ ਨਹੀਂ ਕਰਦੀਆਂ l Rajpal Singh Makhni l Manjit Singh Rajpura l B Social

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DES PUADH : ਸ਼ੂਗਰ ਤੇ ਅਧਰੰਗ ਆਪੇ ਕੀਤੇ ਠੀਕ, ਦਵਾਈਆਂ ਕਿਸੇ ਨੂੰ ਠੀਕ ਨਹੀਂ ਕਰਦੀਆਂ l Rajpal Singh Makhni l Manjit Singh Rajpura l B Social

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Faces of Chemistry: Hair colourants (Procter & Gamble) – Video 2 (14+)

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Faces of Chemistry: Hair colourants (Procter & Gamble) - Video 2 (14+)

Scientists from Procter & Gamble explain the chemistry involved in how hair colourants dye your hair. Aimed at students aged 14+

Faces of Chemistry provides insight into real-life applications of chemistry involved in making products we use in everyday life.

These short videos, aimed at students aged 11-19, are produced in collaboration with leading chemical companies and document views of scientists passionate about the impact they are having on the real world.

For more information and to see more videos, please visit http://www.rsc.org/FacesofChemistry
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Some hair dyes are basically fine-grained paint. But dyes that stick with you for more than a couple weeks physically and chemically change each hair. Learn how with HowStuffWorks.

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This is not my natural hair color. There are three basic chemical formulations of hair dye: temporary, semi-permanent, and permanent. Before we look at what each of them do, let’s look at the physical structure of hair.

Hair is dead stuff. Three layers of slightly different dead stuff. The core, called the medulla, is not pertinent to our interests today.

But it’s surrounded by a thick layer of cells called the cortex – no relation to your brain’s cortex. It’s where you find the pigmented melanin proteins that give hair its color.

Protecting the cortex is hair’s outermost layer: the cuticle. As hair’s armor, it’s made up of overlapping scales. Temporary dye just sticks to the cuticle – it’s more like paint, really, and it’ll usually all circle the drain with your next shampoo.

Semi-permanent dye contains molecules of pigment so tiny that they can slip between the scales of the cuticle and stick to the cortex. But it’s still more paintlike – it doesn’t chemically react with anything in the hair.

The wee pigment particles will wash back out through the cuticle’s scales with soapy water, so a semi-permanent dye lasts about 12 shampoos max.

Permanent dye, as the name suggests, is designed to stay with your hair until the hair grows or falls out. In general, permanent dye consists of two solutions. First, an alkaline chemical plus two types of particles that will come together to form the new color: dye precursors and dye couplers.

Second, the developer: an oxidizer, usually a weak solution of hydrogen peroxide. You (or your salon professional) mix ‘em together right before applying them to your hair.

The alkaline chemical (either ammonia or a gentler substitute) goes to work opening up the cuticle. For dye to be most effective, it needs access to hair’s cortex. The alkaline stuff temporarily softens and relaxes the cuticle’s scales.

The next hurdle in achieving a new hair color is getting rid of some of the existing melanin in the hair’s cortex. Enter the developer. It oxidizes the melanin molecules, breaking melanin’s double carbon-carbon electron bonds and giving up one of its own oxygen atoms to fill in the space.

The result: the melanin turns colorless and releases sulfur atoms. That’s right: part of permanent dye’s characteristic stink isn’t actually the dye at all, but an element of your hair passing into the air.

But that’s not the developer’s only job: It also kicks off the reaction that brings together the new color molecules by oxidizing the dye precursors. These are usually colorless chemicals that develop color when oxidized.

The resulting pigmented particles (called intermediates in industry lingo) are monomers that, left to their own devices, would slip through the cuticle’s scales like semi-permanent dye.

But the dye couplers react with the intermediates to form polymers of pigment that’re too big to just slip back out. That’s how permanent color resists fading through multiple washes: It’s trapped beneath the cuticle.

SOURCES:

http://science.howstuffworks.com/innovation/everyday-innovations/hair-coloring.htm/printable

http://chemistscorner.com/chemical-reactions-in-cosmetic-science/

http://pubs.acs.org/cen/whatstuff/stuff/7811scit4.html

http://www.cancer.gov/cancertopics/causes-prevention/risk/myths/hair-dyes-fact-sheet

Tro, Nivaldo. “Chemistry in Focus: A Molecular View of Our World”. Cengage Learning. Jan 1, 2015. p. 369.

https://books.google.com/books?id=OYXCBAAAQBAJ&pg=PA369&lpg=PA369&dq=hydrogen+peroxide+hair+double+bonds&source=bl&ots=2_ZvbzOJL3&sig=ssaKMhzc-t-W_SCh7bHVBqyY2IA&hl=en&sa=X&ei=HcBHVfm4F8r1oAT-k4HYCg&ved=0CD8Q6AEwBQ#v=onepage&q=hydrogen%20peroxide%20hair%20double%20bonds&f=false

http://www.thechemicalblog.co.uk/why-is-hydrogen-peroxide-used-to-bleach-hair/

http://www.madehow.com/Volume-3/Hair-Dye.html

http://health.howstuffworks.com/skin-care/hair-care/straightening-treatments/a-case-of-good-chemistry-info1.htm/printable

http://www.thechemicalblog.co.uk/why-is-hydrogen-peroxide-used-to-bleach-hair/

http://pgbeautyscience.com/dye-precursors.php

15. Human Sexual Behavior I

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May 5, 2010) Robert Sapolsky explores behavioral patterns of human reproduction. He focuses on proximal and distal motivations, orgasm and fertility facilitation, non-reproductive sex, hormonal and cerebral sexual functions, and the differences and similarities between humans and animals in various physiological realms.

Stanford University:
http://www.stanford.edu/

Stanford Department of Biology:
http://biology.stanford.edu/

Stanford University Channel on YouTube:
http://www.youtube.com/stanford
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Learn all about sexual behavior in just a few minutes! Brooke Miller, Ph.D., instructor of psychology at the University of Texas at Austin, details human sexual desire and behaviors.

This video is part of a complete, condensed Introduction to Psychology series presented in short digestible summaries.

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How Social Status Affects our Self-Worth with Kate Pickett & Richard Wilkinson

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Acclaimed social epidemiologists Kate Pickett and Richard Wilkinson reveal how more equal societies reduce stress, restore sanity and improve everyone’s wellbeing.

Watch Professor Kate Pickett and Professor Richard Wilkinson, in our latest RSA Spotlight – the edits which take you straight to the heart of the event!

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