Become a Simple History member: https://www.youtube.com/simplehistory/join
Support us on Patreon: https://www.patreon.com/simplehistory

The Corinthian Helmet is one of the most iconic designs from ancient Greece taking its name from the city-state of Corinth.


Copyright: DO NOT translate and re-upload our content on Youtube or other social media.

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Credit:
Created by Daniel Turner

Narrator:

Chris Kane
https://vocalforge.com/

Music Credit:
Achilles - Strings by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/r....oyalty-free/index.ht
Artist: http://incompetech.com/



Sources:

Armies of Ancient Greece Circa 500 to 338 BC: History, Organization & Equipment
By Gabriele Esposito

The Battle of Marathon in Scholarship: Research, Theories and Controversies Since 1850 Paperback – 30 May 2014
by Dennis L. Fink

Ballistic Materials and Penetration Mechanics
edited by Roy Laible

Hoplites at War: A Comprehensive Analysis of Heavy Infantry Combat in the Greek World, 750-100 bce
by Paul M. Bardunias (Author), Fred Eugene Ray Jr (Author)

Amandry P., "Casques grecs à décor gravé", Bulletin de Correspondance Hellénique, 1949

Espositio, Gabriel. Armies of Ancient Greece Circa 500 to 338 B.C.: History,Organization, and Equipment.

Toilets may seem harmless, after all - we use them multiple times a day - but don’t be fooled. These disarming devices have caused a surprising number of deaths throughout history. Let’s take a look at a few of them today.

Become a Simple History member: https://www.youtube.com/simplehistory/join
Support us on Patreon: https://www.patreon.com/simplehistory

Copyright: DO NOT translate and re-upload our content on Youtube or other social media.

SIMPLE HISTORY MERCHANDISE

Get the Simple History books on Amazon:

https://www.amazon.com/Daniel-....Turner-%60/e/B00H5TY

T-Shirts

https://teespring.com/stores/s....imple-history-offici

Simple history gives you the facts, simple!

See the book collection here:

Amazon USA

http://www.amazon.com/Daniel-Turner/e/B00H5TYLAE/


Amazon UK
http://www.amazon.co.uk/Daniel....-Turner/e/B00H5TYLAE


https://www.facebook.com/Simpl....e-History-5494376751

https://twitter.com/SimpleHistoryYT


Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)

This calculus video tutorial provides a basic introduction into newton's method. It explains how to use newton's method to find the zero of a function which is the same as the x-intercept.

Derivatives - Fast Review: https://www.youtube.com/watch?v=5yfh5cf4-0w

Introduction to Related Rates:
https://www.youtube.com/watch?v=I9mVUo-bhM8

Local Maximum & Minimum:
https://www.youtube.com/watch?v=WCq3sRzsJfs

Mean Value Theorem:
https://www.youtube.com/watch?v=SL2RobwU_M4

Concavity & Inflection Points:
https://www.youtube.com/watch?v=OhqNbQi9QPk

________________________________
L'Hopital's Rule:
https://www.youtube.com/watch?v=Gh48aOvWcxw

Curve Sketching With Derivatives:
https://www.youtube.com/watch?v=JTVNUdL7sWs

Newton's Method:
https://www.youtube.com/watch?v=-5e2cULI3H8

Optimization Problems:
https://www.youtube.com/watch?v=lx8RcYcYVuU

Marginal Cost & Total Average Cost:
https://www.youtube.com/watch?v=uPp1QZZKc8E

__________________________________
Marginal Revenue and Profit:
https://www.youtube.com/watch?v=VWShego7Ds8

Tangent Line Approximations:
https://www.youtube.com/watch?v=XQaCbFMnDo0

Differentials & Local Linearization:
https://www.youtube.com/watch?v=C5RI5eLzVfo

Estimating Function Values:
https://www.youtube.com/watch?v=NL0NFV-O8Vg

Antiderivatives:
https://www.youtube.com/watch?v=xaCPDMEkbig

__________________________________
Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

How to Divide Numbers Using Long Division? Basic Math Review

For Sharpie Markers you can visit their online stores:
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Civil Service Examination Reviewer Playlist:
Solving Age Problems PART 1 - Civil Service Exam
https://youtu.be/FZmZUaet3Ig
How to Solve Age Problems (Part 2) - Civil Service Exam - LET Exam
https://youtu.be/738Xx0qfX2E
Number Series - Math Reviewer - Civil Service Exam and LET
https://youtu.be/TfvN_NSbfdk
Order of Operations - PEMDAS - Civil Service Exam & LET Reviewer
https://youtu.be/pfnctEEWuuM
How to Solve Word Problems in Ratio and Proportion
https://www.youtube.com/watch?v=TrunSSuYrAg
How to Solve Number Problems? | Civil Service Exam - LET
https://youtu.be/95dGkfHGWT0
Percentage Hacks! How to Get the Percentage of a Number?
https://youtu.be/h8yfFXq-pCI

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Create Professional Slides in Seconds with 2 FREE AI Tools

Learn how to combine Google Gemini and Notebook LM to build high-quality presentations in under five minutes. This step-by-step tutorial reveals a powerful, free workflow to turn research into professional slides for any business use case.

00:00 - Intro: The Ultimate AI Combo
00:52 - Understanding Google Gemini
01:29 - What is Notebook LM?
01:49 - Step 1: Research with Gemini
03:03 - Step 2: Organizing in Notebook LM
04:07 - Step 3: Building Slide Structures
05:41 - Best Tools for Slide Design
09:12 - Why This Combo Beats ChatGPT

In this video I would like to talk about the history of microscopes.During the 1590s, the two spectacle-makers, Hans and Zacharias Jansen began experimenting. They put lenses in a tube and made a very important discovery. They discovered that objects near the end of the tube appeared to be enlarged, much larger than any simple magnifying glass could achieve alone.

In the 1660’s Robert Hooke began looking at all kinds of objects with his microscope.
He put all of his drawings in a book called Micrographia
He is credited with naming cells but also studied items like fleas under his microscope.
Anton van Leeuwenhoek was very good at grinding and polishing lenses.
These lenses led to the building of his microscope which was considered the first practical microscope.
In 1674 Anton Van Leeuwenhoek was the first to see and describe bacteria.
Another huge advance in microscopes didn’t occur until German physicist Ernst Ruska and the electrical engineer Max Knoll constructed the prototype electron microscope in 1931, capable of four-hundred-power magnification.
Electron microscopes uses accelerated electrons in order to view objects.
Modern electron microscopes can magnify objects up to 10 million times

-~-~~-~~~-~~-~-
Please watch: "Study Skills Teacher's Secret Guide to your Best Grades"
https://www.youtube.com/watch?v=f3bsg8gaSbw
-~-~~-~~~-~~-~-
*
*
For more Life Science videos and summaries see,
http://www.moomoomath.com/Midd....le-School-Science-an

Is Google Gemini's guided learning feature truly a superior learning tool? This video offers an AI comparison, contrasting it with regular Gemini to see which approach better supports student learning. It's a must-see for educators interested in classroom technology and AI in education.

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/geometry/xff63fac

Watch the next lesson: https://www.khanacademy.org/math/algebra2/conics_precalc/parabolas_precalc/v/finding-focus-and-directrix-from-vertex?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII

Missed the previous lesson?
https://www.khanacademy.org/math/algebra2/conics_precalc/parabolas_precalc/v/using-the-focus-and-directrix-to-find-the-equation-of-a-parabola?utm_source=YT&utm_medium=Desc&utm_campaign=AlgebraII

Algebra II on Khan Academy: Your studies in algebra 1 have built a solid foundation from which you can explore linear equations, inequalities, and functions. In algebra 2 we build upon that foundation and not only extend our knowledge of algebra 1, but slowly become capable of tackling the BIG questions of the universe. We'll again touch on systems of equations, inequalities, and functions...but we'll also address exponential and logarithmic functions, logarithms, imaginary and complex numbers, conic sections, and matrices. Don't let these big words intimidate you. We're on this journey with you!

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.

For free. For everyone. Forever. #YouCanLearnAnything

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Communities for Kids - Types of Communities | Social Studies for Kids | Kids Academy

What are social communities? A social community is regarded as a group of people who live and work together in a particular area.

People belonging to a specific community also go to the same schools, offices, and hospitals. They are dedicated to helping each other in the time of need. They help them in solving their problems.

Families and friends are the most important part of social communities. We live with our family and we go out with our friends, and do the same type of things. Your neighborhood makes a community, and you will find a number of schools, libraries, offices, shops, and stores all in one place.

As a community, we should be aware of our role as community members, and we should become good citizens to play our role in the community.


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Kids Academy Talented and Gifted Program for kids aged 2-10:

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Visit http://www.mathantics.com for more Free math videos and additional subscription based content!

It can be daunting to move from the abstract idea stage to the realm of bank accounts, taxes, and liability. Sometimes, it can feel like you’re making arbitrary decisions, but we’re going to wade through the legalese together. Things are about to get legit.

Click here for the chart!
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Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Eric Prestemon, Sam Buck, Mark Brouwer, Indika Siriwardena, Avi Yashchin, Timothy J Kwist, Brian Thomas Gossett, Haixiang N/A Liu, Jonathan Zbikowski, Siobhan Sabino, Zach Van Stanley, Jennifer Killen, Nathan Catchings, Brandon Westmoreland, dorsey, Kenneth F Penttinen, Trevin Beattie, Erika & Alexa Saur, Justin Zingsheim, Jessica Wode, Tom Trval, Jason Saslow, Nathan Taylor, Khaled El Shalakany, SR Foxley, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, David Noe, Shawn Arnold, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
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0:00 - Introduction
0:08 - Great Inventions: The Wheel
3:05 - Great Inventions: The Bicycle
7:25 - History of the Telephone
12:36 - Great Inventions: The Printing Press
17:04 - Great Inventions: The Steam Engine

Subscribe to Happy Learning: https://my.happylearning.tv/

From the wheel to the telephone, discover the most important inventions in history in this educational video for children. Learn how these creations changed the world and who their inventors were. A journey through science, technology, and human creativity. 🛠️🌍

History in Primary School helps children understand the past to grasp the present and build the future. From Prehistory, Ancient Egypt, and the Roman Empire, to the Middle Ages, discoveries, and revolutions, each video is designed to make learning dynamic and exciting. They will learn how societies have evolved, how inventions and advances have transformed the world, and the importance of learning from history to make better decisions.

Curiosities for kids:https://www.youtube.com/playli....st?list=PLLF_mZmNqOn


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I’m guessing you’re pretty familiar with ice. We use it in our drinks, slip on it, skate on it, worry about climate change melting it. But have you ever stopped to really think about this stuff? The freezing and melting of water affects so much of our world. It’s ice crystals in thunderclouds that create lightning. Ice is powerful enough crack boulders, float stones, and alter entire landscapes. Ice is such a common substance, you'd think we'd know everything about it by now. But it has some secrets and weird properties we’ve only just begun to figure out. One question about ice that's, still not totally answered, is one of the most obvious: why is ice slippery? It's a more complicated answer than it seems!


References: https://sites.google.com/view/....why-is-ice-slippery-

Special thanks to our Brain Trust Patrons:
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Have you ever been to an onsen? Sakura is introducing onsen (hot springs). Let's listen to what she has to say.
你有浸過日式温泉嗎？ Sakura正在介紹有關日式温泉和浸浴前的注意事項。
https://youtube.com/shorts/bKc....VL1u-rpc?feature=sha

If you want to know more about Sakura. Here is her self introduction.
如果你想了解Sakura更多，請觀看她的自我介紹影片：
https://youtu.be/U28FL4p82Eo
-----------------------------------------------------------------------------------
Please SUBSCRIBE to our channel, LIKE, and SHARE to encourage us to share more useful and interesting knowledge.
請訂閱我們的頻道、點讚、分享，鼓勵我們分享更多有用又有趣的知識。
-----------------------------------------------------------------------------------
Welcome to watch our videos
歡迎觀看我們所創作的的其他影片
1）Basic Conversation 會話
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

2) Grammar 語法
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

3）English Speaking
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

4）Funny Jokes 笑話
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

5）Vocabulary 詞彙
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

6）English Idioms 英語成語
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

7）Revision Exercise 重温練習
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

8）Fun Games 趣遊戲味
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

9） Tongue Twister 繞口令
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

10）Writing a composition 作文
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

This precalculus video tutorial explains how to find the domain and range of a function given its graph in interval notation. The domain represents all of the x values in the function and the range represents all of the y values. You should use parentheses for open circles and infinity symbols but you should brackets for closed circles. This video contains plenty of examples and practice problems of finding the domain and range of a graph.

Functions and Graphs Practice Test:
https://www.youtube.com/watch?v=kvU9sOzT2mk

Transformations of Functions:
https://www.youtube.com/watch?v=Tmdrjs9xufc

____________________________________________
How To Find The Range of a Function:
https://www.youtube.com/watch?v=Si2vmzUWfJE

Domain and Range - More Examples:
https://www.youtube.com/watch?v=KyOQhC8ctxc

Domain and Range From a Graph:
https://www.youtube.com/watch?v=KirGQOwjBVI

____________________________________________
Domain and Range - Radical Functions:
https://www.youtube.com/watch?v=VM3iMj0BwLE

Domain of Logarithmic Functions:
https://www.youtube.com/watch?v=WfgYJy035k0

Domain and Range - Piecewise Functions:
https://www.youtube.com/watch?v=0ZoSxPg6JSQ

Domain and Range - Inverse Functions:
https://www.youtube.com/watch?v=wP4JjdFbCkY

_____________________________________________
SAT Math Test Prep:
https://www.youtube.com/watch?v=fTGuTEQCsZY

ACT Math Test Prep:
https://www.youtube.com/watch?v=SsA7rZ8kczM

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Math & Science Videos:
https://www.patreon.com/mathsc....iencetutor/collectio

Mixed Fraction Trick | Fast Simplify Trick | Simplification Trick in Hindi #shorts #simplification

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Students conduct a simple experiment to see how the water level changes in a beaker when a lump of clay sinks in the water and when the same lump of clay is shaped into a bowl that floats in the water. They notice that the floating clay displaces more water than the sinking clay does, perhaps a surprising result. Then they determine the mass of water that is displaced when the clay floats in the water. A comparison of this mass to the mass of the clay itself reveals that they are approximately the same.

View the full activity at TeachEngineering:
https://www.teachengineering.o....rg/activities/view/d

TeachEngineering has over 1,500 FREE lessons and activities.
Visit http://www.TeachEngineering.org for more!

Music: Thingamajig- Audionautix

Practice Your Spanish With Chateo - a Spanish-speaking chatbot! | Get a discount off your first 6 months with code CHATEOBOT | Sign up at: https://www.senorjordan.com/chat
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This video lesson covers another 'past tense' in the Spanish language: the imperfect. This video scratches the surface of some of the uses of the imperfect but later we'll go more in depth.

Rate this video if it was helpful.

Let me know if you have any questions, comments or suggestions about this video.

For more free Spanish video lessons, word banks and verb conjugation charts, visit http://www.senorjordan.com

Thanks for watching!

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/trigonometry/basic-trigonometry/cc-trig-ratios-similarity/e/trigonometric-functions-and-side-ratios-in-right-triangles?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Watch the next lesson: https://www.khanacademy.org/math/trigonometry/basic-trigonometry/cc-trig-ratios-similarity/v/sine-and-cosine-of-complements-example?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Missed the previous lesson?
https://www.khanacademy.org/math/trigonometry/basic-trigonometry/basic_trig_ratios/v/example-trig-to-solve-the-sides-and-angles-of-a-right-triangle?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Trigonometry on Khan Academy: Big, fancy word, right? Don't be fooled. Looking at the prefix, tri-, you could probably assume that trigonometry ("trig" as it's sometimes called) has something to do with triangles. You would be right! Trig is the study of the properties of triangles. Why is it important? It's used in measuring precise distances, particularly in industries like satellite systems and sciences like astronomy. It's not only space, however. Trig is present in architecture and music, too. Now you may wonder...how is knowing the measurement and properties of triangles relevant to music?? THAT is a great question. Maybe you'll learn the answer from us in these tutorials!

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.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Trigonometry channel:
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Detailed analysis of the rent vs. buy decision. Created by Sal Khan.

Watch the next lesson:
https://www.khanacademy.org/economics-finance-domain/core-finance/housing/mortgages-tutorial/v/introduction-to-mortgage-loans?utm_source=YT&utm_medium=Desc&utm_campaign=financeandcapitalmarkets

Missed the previous lesson? Watch here: https://www.khanacademy.org/economics-finance-domain/core-finance/housing/renting-v-buying/v/renting-vs-buying-a-home-part-2?utm_source=YT&utm_medium=Desc&utm_campaign=financeandcapitalmarkets

Finance and capital markets on Khan Academy: Is it always better to buy than rent? What if home prices go up dramatically and rents don't? How can we compare home prices to rents to figure out what to do. This older tutorial (low-res, bad handwriting) walks us through this. It is about housing but similar thinking can be applied to any rent-vs-buy decision (spoiler alert, Sal did eventually buy a home).

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Subscribe to Khan Academy’s Finance and Capital Markets channel: https://www.youtube.com/channe....l/UCQ1Rt02HirUvBK2D2
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