Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/hu....manities/world-histo

Created by Sal Khan.

Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/world-history/euro-hist/hitler-nazis/e/adolf-hitler?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory

Watch the next lesson: https://www.khanacademy.org/humanities/world-history/euro-hist/mussolini-fascism/v/fascism-and-mussolini?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory

Missed the previous lesson? https://www.khanacademy.org/humanities/world-history/euro-hist/hitler-nazis/v/night-of-the-long-knives?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory

World history on Khan Academy: From the earliest civilizations to the modern world, geography, religion, trade, and politics have bound peoples and nations together — and torn them apart. Take a journey through time and space and discover the fascinating history behind the complex world we inhabit today.

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 World History channel: https://www.youtube.com/channe....l/UC6KRvvmvkCchFMo2E
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

This algebra video tutorial explains how to add and subtract radical expressions with square roots and cube roots all with variables and exponents. You need to simplify the radical expressions before adding or subtracting the radical expressions. The number inside the square root must be the same before you can add or subtract the coefficients.

Square Roots and Cube Roots: https://www.youtube.com/watch?v=IWzPle0KDPo

Simplifying Radical Expressions:
https://www.youtube.com/watch?v=U7AXF75rC00

Multiplying Radical Expressions:
https://www.youtube.com/watch?v=i0TMNeOwpSg

Adding & Subtracting Radicals:
https://www.youtube.com/watch?v=83wXAgwcWH0

Simplifying Cube Root Expressions:
https://www.youtube.com/watch?v=VdUNTsf14qs

__________________________________
Rationalizing The Denominator:
https://www.youtube.com/watch?v=5j8a75aHaSE

Multiplying Radicals With Different Indices:
https://www.youtube.com/watch?v=onOQMAcnj8U

How To Solve Radical Equations:
https://www.youtube.com/watch?v=0gicD4STzpg

Solving Equations With Cube Roots:
https://www.youtube.com/watch?v=mg8aS58vsN8

Solving Complex Radical Equations:
https://www.youtube.com/watch?v=laEeUSZr83s

____________________________________
How To Graph Radical Functions:
https://www.youtube.com/watch?v=8t9_IXFzH_M

Domain of Radical Functions:
https://www.youtube.com/watch?v=fOlon31vEU4

How To Graph Cube Root Functions:
https://www.youtube.com/watch?v=qxR6p_xDnho

Radical Expressions - Test Review:
https://www.youtube.com/watch?v=wOcc5EoOojE

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

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

This video explains how to find the determinant of a 3x3 matrix.

Introduction to Matrices: https://www.youtube.com/watch?v=yRwQ7A6jVLk

Adding and Subtracting Matrices:
https://www.youtube.com/watch?v=QXUbFzEd3Ww

Scalar Multiplication of Matrices:
https://www.youtube.com/watch?v=iJERwUVuwtY

Solving Matrix Equations:
https://www.youtube.com/watch?v=UHhvcj0doaA

Multiplying Matrices:
https://www.youtube.com/watch?v=vzt9c7iWPxs

__________________________________
Gaussian Elimination & Row Echelon Form:
https://www.youtube.com/watch?v=eDb6iugi6Uk

Gauss Jordan Elimination:
https://www.youtube.com/watch?v=eYSASx8_nyg

Gaussian Elimination With 4 Variables:
https://www.youtube.com/watch?v=4VAXv6yRULU

Inverse of a 2x2 Matrix:
https://www.youtube.com/watch?v=aiBgjz5xbyg

Inverse of a 3x3 Matrix:
https://www.youtube.com/watch?v=Fg7_mv3izR0

__________________________________
Determinant of 2x2 and 3x3 Matrix:
https://www.youtube.com/watch?v=3ROzG6n4yMc

Determinant of 4x4 Matrix:
https://www.youtube.com/watch?v=fWzUwrt1Z0s

Cramer's Rule - 2x2 Linear System:
https://www.youtube.com/watch?v=vXqlIOX2itM

Cramer's Rule - 3x3 Linear System:
https://www.youtube.com/watch?v=Ot87qLTODdQ

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

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

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

Introduction to separable differential equations.

Watch the next lesson: https://www.khanacademy.org/ma....th/differential-equa-2?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialEquations

Missed the previous lesson?
https://www.khanacademy.org/math/differential-equations/first-order-differential-equations/separable-equations/v/particular-solution-to-differential-equation-example?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialEquations

Differential Equations on Khan Academy: Differential equations, separable equations, exact equations, integrating factors, homogeneous equations.

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 KhanAcademy’s Differential Equations channel:: https://www.youtube.com/channe....l/UCxSQHGkaDv8UKXE0T
Subscribe to KhanAcademy: https://www.youtube.com/subscr....iption_center?add_us

This physics video tutorial provides a basic introduction into heat engines. it explains how to calculate the mechanical work performed by a heat engine using heat flowing from the hot reservoir and the heat energy flowing into the cold reservoir. It explains how to calculate the thermal efficiency of a heat engine as well as the power rating in kW and horsepower. It discusses how to calculate the mechanical work performed per cycle and through many cycles given the energy of combustion of a fuel. This thermodynamics video tutorial contains a lot of examples and practice problems for you to work on.

Open Vs Closed Vs Isolated System:
https://www.youtube.com/watch?v=TFP6SvWPOQc

First Law of Thermodynamics:
https://www.youtube.com/watch?v=7Siv2NNCFag

Isobaric Process:
https://www.youtube.com/watch?v=BG-cUpnNmPM

Isochoric Process:
https://www.youtube.com/watch?v=SxfgHdfKjQA

Isothermal Process:
https://www.youtube.com/watch?v=m9h6qyWLscs

Internal Energy of an Ideal Gas:
https://www.youtube.com/watch?v=k3rJs_ioTHc

_________________________
Adiabatic Process:
https://www.youtube.com/watch?v=gaZmZjBtgAM

PV Diagrams:
https://www.youtube.com/watch?v=b-4U_s4e50o

Thermodynamics Review:
https://www.youtube.com/watch?v=TnDCxw0y6YM

2nd Law of Thermodynamics:
https://www.youtube.com/watch?v=DWiCaDPM7Hk

Converting Heat Into Electricity:
https://www.youtube.com/watch?v=LX2cU27kUUc

________________________
Carnot Cycle:
https://www.youtube.com/watch?v=Qi3m9sD5w-A

Otto Cycle:
https://www.youtube.com/watch?v=vAeMmSRdQYY

Refrigerators and Heat Pumps:
https://www.youtube.com/watch?v=sKfgz6JLQRI

Entropy:
https://www.youtube.com/watch?v=Bdn3u2OHvKE

Heat Engines and Refrigerators Review:
https://www.youtube.com/watch?v=QBd2zraOe2k

Physics PDF Worksheets:
https://www.video-tutor.net/ph....ysics-basic-introduc

This Calculus 3 video tutorial explains how to find the equation of a plane given three points.

Area - Vector Cross Product: https://www.youtube.com/watch?v=YbZmAqGUkqc

Triple Scalar Product:
https://www.youtube.com/watch?v=6NeAK0rJwlk

Vector Equations of Lines:
https://www.youtube.com/watch?v=MkjazYnvNP8

The Equation of a Plane:
https://www.youtube.com/watch?v=2sZKZHyaQJ8

Planar Equation - 3 Points:
https://www.youtube.com/watch?v=rL9UXzZYYo4

_______________________________
Lines & Planes - Intersection:
https://www.youtube.com/watch?v=_W3aVWsMp14

Angle Between Two Planes:
https://www.youtube.com/watch?v=7G07dPSlWbY

Distance Between Point and Plane:
https://www.youtube.com/watch?v=zWMTTRJ0l4w

Chain Rule - Partial Derivatives:
https://www.youtube.com/watch?v=XipB_uEexF0

Implicit Partial Differentiation:
https://www.youtube.com/watch?v=OBELQIPH5xY

________________________________
Directional Derivatives:
https://www.youtube.com/watch?v=CnVes9TdnPo

Limits of Multivariable Functions:
https://www.youtube.com/watch?v=E1lMMBpz8YM

Double Integrals:
https://www.youtube.com/watch?v=BJ_0FURo9RE

Local Extrema & Critical Points:
https://www.youtube.com/watch?v=UID893EosM8

Absolute Extrema - Max & Min:
https://www.youtube.com/watch?v=Hg38kfK5w4E

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

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

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

Inflection points are points where the function changes concavity, i.e. from being "concave up" to being "concave down" or vice versa. They can be found by considering where the second derivative changes signs. In similar to critical points in the first derivative, inflection points will occur when the second derivative is either zero or undefined. Created by Sal Khan.

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/ap-calculus-ab/ab-derivatives-analyze-functions/ab-concavity/e/analyze-points-of-inflection-graphical?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB

Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-ab/ab-derivatives-analyze-functions/ab-concavity/v/inflection-points-graphically-given-function?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB

Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-ab/ab-derivatives-analyze-functions/ab-concavity/v/recognizing-concavity-exercise?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB

AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP Calculus at Phillips Academy in Andover, Massachusetts, and heÕs part of the teaching team that helped develop Khan AcademyÕs AP lessons. Phillips Academy was one of the first schools to teach AP nearly 60 years ago.

About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan AcademyÕs AP Calculus AB channel: https://www.youtube.com/channe....l/UCyoj0ZF4uw8VTFbml
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

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Credit:
Created by Daniel Turner

Narrator:

Bryan 'Lazlo' Beauregard



Music Credit

Eyes of Glory - Aakash Gandhi

#UNANGHAKBANGSAPAGBASANGTAGALOG
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The vowel a can make a short /ă/ sound or a long /ā/ sound. Learn about the vowel a with Reya the Red Panda from Khan Academy Kids!

Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade.

Available on Google Play, Apple, and Amazon app stores:
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You can also access other videos on vowels and vowel teams on our Vowels and Vowel Teams playlist here: http://khan.co/KhanKids-Vowels.

Subscribe to our channel for more videos like this.

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June 10th 1990 at 8.20, Flight 5390
What happened when a Captain was sucked out of the airplane window at 17,000 feet?

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:

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T-Shirts

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Simple history gives you the facts, simple!

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

Chris Kane
https://vocalforge.com/

Beyond the Black Box: The Forensics of Airplane Crashes
By George Bibel

The Mammoth Book of Air Disasters and Near Misses
By Paul Simpson

This math video tutorial provides a basic introduction into basic division. It explains how to identify the quotient, dividend, divisor, and remainder.

Basic Addition: https://www.youtube.com/watch?v=2WxfQIElJuw
Basic Subtraction: https://www.youtube.com/watch?v=3fYgZgbOJmM
Addition and Subtraction - Number Lines: https://www.youtube.com/watch?v=wNhbz1EUPrc
Long Multiplication: https://www.youtube.com/watch?v=GKetIwxaenA
Lattice Multiplication: https://www.youtube.com/watch?v=ZDmNdjiYAIw
Area Model Multiplication: https://www.youtube.com/watch?v=UV0ky5fESI0
Basic Division: https://www.youtube.com/watch?v=yAJxHO7CLh4
Long Division: https://www.youtube.com/watch?v=GiiuZ8sfw00
Short Division: https://www.youtube.com/watch?v=uKsSB8zIR9M
Mental Math Tricks: https://www.youtube.com/watch?v=nTn9gVqRfKY
Exponentiation and Tetration: https://www.youtube.com/watch?v=S3s9cWWnZj0
_______________________________________________________________________________________________
Fractions - Basic Introduction: https://www.youtube.com/watch?v=3TklZi6MeJ4
Simplifying Fractions: https://www.youtube.com/watch?v=PcEwj5_v75g
Adding Fractions - Unlike Denominators: https://www.youtube.com/watch?v=5fbzZEK77DQ
Subtracting Fractions: https://www.youtube.com/watch?v=8ZbIrASBj54
Multiplying Fractions: https://www.youtube.com/watch?v=sR83TDp_g2c
Dividing Fractions: https://www.youtube.com/watch?v=Ht8O3cJ9yJ8
________________________________________________________________________________________________
Mixed Numbers - Basic Intro: https://www.youtube.com/watch?v=PZGx0nSxzjs
Improper Fractions to Mixed Numbers: https://www.youtube.com/watch?v=zvLql0wBM4E
Mixed Numbers to Improper Fractions: https://www.youtube.com/watch?v=r_skHxRWZFw
Adding Mixed Numbers + Whole Numbers: https://www.youtube.com/watch?v=I3sfDiKVw-Y
Adding Mixed Numbers: https://www.youtube.com/watch?v=EvYgX0wz0xY
Subtracting Mixed Numbers and Fractions: https://www.youtube.com/watch?v=jzVz0A9cnNk
Multiplying Mixed Numbers and Fractions: https://www.youtube.com/watch?v=5tv4vRNQqHk
Multiplying Mixed Numbers: https://www.youtube.com/watch?v=idymJjnnXME
Dividing Mixed Numbers By Whole Numbers: https://www.youtube.com/watch?v=Iw2YpA1myfc
Dividing Mixed Numbers: https://www.youtube.com/watch?v=BOvKBaeqhKw
_______________________________________________________________________________________________
Rounding Numbers & Decimals: https://www.youtube.com/watch?v=LGRoPAPMZhA
Adding Decimals: https://www.youtube.com/watch?v=SKRbgU_A1VU
Subtracting Decimals: https://www.youtube.com/watch?v=MdthGCQfC0o
Multiplying Decimals: https://www.youtube.com/watch?v=dSFja7Jsg6c
Dividing Decimals: https://www.youtube.com/watch?v=bHkI3hGQhZI
_______________________________________________________________________________________________
Percentages Made Easy: https://www.youtube.com/watch?v=WYWPuG-8U5Q
Percentage Word Problems: https://www.youtube.com/watch?v=kjpwBu6DmkM
Sales Tax, Discount, & Original Price: https://www.youtube.com/watch?v=TRlC8lqkhT4
Unit Rates, Ratios, & Proportions: https://www.youtube.com/watch?v=s0RBRkehzwo
Ratios and Proportions - Word Problems: https://www.youtube.com/watch?v=JOZSFwuyqok
Acid Mixture Word Problems: https://www.youtube.com/watch?v=e2FAAMlAJ3c
Translating Words to Algebraic Expressions: https://www.youtube.com/watch?v=QEnFIgN8UBw
Words to Equations - More Problems: https://www.youtube.com/watch?v=VjPX-XlN7Ok
Consecutive Integers Word Problems: https://www.youtube.com/watch?v=hPnoxAf60c0
Simple Interest - Word Problems: https://www.youtube.com/watch?v=NCYNXkbTTUo
Future Value of an Annuity Math Problem: https://www.youtube.com/watch?v=bcuXY8WkjF4

Did you know that the pyramids are gigantic tombs of the pharaohs of Ancient Egypt? These majestic monuments were a symbol of power. Mummies are the bodies of pharaohs and people of power from a long time ago wrapped in bandages. The mummification process guaranteed the immortality of the soul in ancient Egypt.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

If you like our videos, download Smile and Learn now. You’ll discover thousands of activities for children aged 3 to 12 years, all designed by educators. We have hundreds of games, interactive stories and videos in five languages: English, Spanish, Portuguese, Italian, Turkish and French. Try a month for free and start the adventure!

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LOL

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

In this video, we think about what |a-b| really means, and we verify that |a-b| = |b-a| by looking at an example.

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-negative-numbers-add-and-subtract/cc-7th-absolute-value/e/absolute-value-to-find-distance?utm_source=YT&utm_medium=Desc&utm_campaign=7thgrade

Watch the next lesson: https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-negative-numbers-add-and-subtract/cc-7th-absolute-value/v/interpreting-absolute-value-as-distance?utm_source=YT&utm_medium=Desc&utm_campaign=7thgrade

Missed the previous lesson?
https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-negative-numbers-add-and-subtract/cc-7th-add-sub-word-problems-w-negatives/v/interpreting-negative-number-statements?utm_source=YT&utm_medium=Desc&utm_campaign=7thgrade

Grade 7th on Khan Academy: 7th grade takes much of what you learned in 6th grade to an entirely new level. In particular, you'll now learn to do everything with negative numbers (we're talking everything--adding, subtracting, multiplying, dividing, fractions, decimals... everything!). You'll also take your algebraic skills to new heights by tackling two-step equations. 7th grade is also when you start thinking about probability (which is super important for realizing that casinos and lotteries are really just ways of taking money away from people who don't know probability) and dig deeper into the world of data and statistics. Onward! (Content was selected for this grade level based on a typical curriculum in the United States.)

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 à ªs 7th grade channel:
https://www.youtube.com/channe....l/UCzKsXcrLSLDG7VN1L
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

This trigonometry video tutorial provides a basic introduction to the double angle identities of sine, cosine, and tangent. It explains how to derive the double angle formulas from the sum and difference identities of sin, cos, and tan and how to use the double angle formulas to find the exact value of trigonometric expressions using right triangle trigonometry and SOHCAHTOA. This video contains many examples and practice problems for you to learn this material.

Bearing Problems and Navigation:
https://www.youtube.com/watch?v=cSKAqfGXOPI

Two Triangle Problems - More Examples:
https://www.youtube.com/watch?v=QM1T6eL8t48

Verifying Trigonometric Identities:
https://www.youtube.com/watch?v=Rf05H8ogHLg

Sum and Difference Identities:
https://www.youtube.com/watch?v=gEhxBFQCYic

Verifying Trig Identities With Double Angles:
https://www.youtube.com/watch?v=Wh7hM_FsN3Y

__________________________
Power Reducing Formulas:
https://www.youtube.com/watch?v=U6yjjaK8aCc

Half Angle Formulas:
https://www.youtube.com/watch?v=9YI69okba3c

Verifying Trig Identities Using Half Angles:
https://www.youtube.com/watch?v=qWJ4HwJ_5LY

Inverse Trig Functions With Double Angles:
https://www.youtube.com/watch?v=waDbbpib9cM

Right Triangle Trig With Half Angle Identities:
https://www.youtube.com/watch?v=vEU25NlpaXA

Product To Sum + Sum to Product Formulas:
https://www.youtube.com/watch?v=8Prc7VGt40w

______________________________
Solving Trig Equations - Finding All Solutions:
https://www.youtube.com/watch?v=kEcbxiLeGTc

Solving Trig Equations With Multiple Angles:
https://www.youtube.com/watch?v=eZPEW2hVUd0

Solving Trig Equations With Double Angles:
https://www.youtube.com/watch?v=-R7394Dn854

Trigonometry Final Exam Review:
https://www.youtube.com/watch?v=OAsbx4TEnL0

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

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

Start your mercenary career right now! Sign up for free https://bit.ly/AW_Simple-History and receive the Type 59-IIA Tier 4 Premium MBT and 7 days of Premium Time directly to your account!

Located near the town of Meppen in Lower Saxony, Germany, is one of the largest weapons testing sites in Europe, Wehrtechnische Dienststelle 91 - the WTD-91.
Its total area is 19,200 hectares and it is 19 miles long and 3 to 4 miles wide.
Equipped with high-tech measuring devices, the WTD-91 is the leading testing site of the German Bundeswehr, where extensive testing of tanks and self-propelled howitzers are conducted.

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

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

Chris Kane
https://vocalforge.com/