Subscribe to Sound Field! https://www.youtube.com/channe....l/UCvMLMyKPomE6kTTL9
Today we’re going to talk about recommender systems which form the backbone of so much of the content we see online from video recommendations on YouTube and Netflix to ads we see on Facebook, Twitter, and well, everywhere else. We’ll talk about their types of systems - content-based, social, and personalized recommendations - and take a closer look at what they're good at, but also why they often fail.

Crash Course is produced in association with PBS Digital Studios: https://www.youtube.com/pbsdigitalstudios

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, Sam Ferguson, Yasenia Cruz, Eric Koslow, Tim Curwick, David Noe, Shawn Arnold, William McGraw, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
--

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

#CrashCourse #MachineLearning #ArtificialIntelligence

Today, we're going to talk about one of the earliest animal senses, one that every life form we've ever found seems to have -- chemosensation -- or our sense of taste and smell. We'll discuss how animals use these senses to explore their environment and communicate, and how that pair of nostrils of yours is an example of convergent evolution. Also, before we wrap up our discussion of animal senses we're going to talk about a couple so specialized that seem straight from the pages of comic books -- the ability to sense electric and magnetic fields!

🦔🐒🐝🐛🐘🐍🐀🐠 🐢🐋🐅🦓🦇🦜🐜🪱🦑 🦀🐊

Learn more about Rae here! https://www.raewynngrant.com​​
Watch our videos and review your learning with the Crash Course App!
Download here for Apple Devices: https://apple.co/3d4eyZo
Download here for Android Devices: https://bit.ly/2SrDulJ

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:

Vincent, Emilee Murphy, Michael Wang, Jordan willis, Krystle Young, Michael Dowling, Alexis B, Rene Duedam, Burt Humburg, Aziz, Nick, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, Junrong Eric Zhu, Alan Bridgeman, Rachel Creager, Jennifer Smith, Matt Curls, Tim Kwist, Jonathan Zbikowski, Jennifer Killen, Sarah & Nathan Catchings, Brandon Westmoreland, team dorsey, Trevin Beattie, Divonne Holmes à Court, Eric Koslow, Indika Siriwardena, Khaled El Shalakany, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, William McGraw, Andrei Krishkevich, Sam Ferguson, Eric Prestemon, Jirat, TheDaemonCatJr, Wai Jack Sin, Ian Dundore, Jason A Saslow, Justin, Jessica Wode, Mark, Caleb Weeks
__

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Tumblr - http://thecrashcourse.tumblr.com
Support Crash Course on Patreon: http://patreon.com/crashcourse

CC Kids: http://www.youtube.com/crashcoursekids

Pete the Cat Goes Camping (I Can Read Level 1)
by James Dean
Read by Let's Read Stories

New York Times bestselling author and artist James Dean takes readers along for an outdoor adventure with Pete the Cat!

In Pete the Cat Goes Camping, Pete can't wait to go hiking, fishing, and eat s'mores by the campfire. But when he hears about the mysterious creature named Bigfoot, Pete can't help but wonder: Is Bigfoot real?

Pete the Cat Goes Camping is a Level 1 I Can Read book, which means it's perfect for shared reading with a child.

Click here to purchase Pete the Cat Goes Camping (I Can Read Level 1): https://www.amazon.com/Pete-Go....es-Camping-Read-Leve

Pete the Cat’s Trip to the Supermarket
by James Dean
Read by Let’s Read Stories

Pete the Cat helps out at the supermarket in this Level 1 I Can Read tale from New York Times bestselling creators Kimberly and James Dean

Along with his dad and brother, Pete the Cat heads off to the supermarket. But what happens when Dad loses the grocery list before they even get there? It’s up to Pete and Bob to help remind Dad what was on their list!

Pete the Cat's Trip to the Supermarket is a Level I Can Read book, complete with original illustrations from the creators of Pete the Cat, Kimberly and James Dean, and is perfect for children learning to sound out words and sentences.

Click here to purchase Pete the Cat’s Trip to the Supermarket: https://www.amazon.com/Pete-Ca....ts-Trip-Supermarket-

Pete the Kitty and the Groovy Playdate (Pete the Cat)
by James Dean
Read by Let's Read Stories

This groovy series from New York Times bestselling team James and Kimberly Dean introduces Pete the Cat before he was Pete the Cat...when he was little Pete the Kitty!

Pete the Kitty is super excited to visit his friend Grumpy Toad’s house for a playdate! Grumpy Toad has all the best toys: a truck, building blocks, and a superhero cape. Far out! It’s going to be cat-tastic!

But when Grumpy Toad refuses to share any of his cool toys with Pete, neither of them are having any fun. Will Grumpy Toad ever share his toys with his friend Pete?

In this easy-to-read and engaging picture book, little readers will learn all about sharing with their favorite blue kitten!

Click here to purchase Pete the Kitty and the Groovy Playdate (Pete the Cat): https://www.amazon.com/Pete-Ki....tty-Groovy-Playdate-

There Was an Old Lady Who Swallowed a Clover - Saint Patrick's Day Stories for Children
by Lucille Colandro
Illustrated by Jared Lee

Click here to purchase There Was an Old Lady Who Swallowed a Clover: https://www.amazon.com/There-W....as-Lady-Swallowed-Cl

There was an Old Lady who swallowed things over and over, and now she's come back to swallow a clover!

She's back! That lovely old lady has returned just in time for St. Patrick's Day. Now she's swallowing items to make the perfect rainbow to hide a pot of gold.

We're All Wonders - Children's Stories Read Aloud for Kids

Click here to purchase We're All Wonders: https://www.amazon.com/Were-Al....l-Wonders-R-Palacio/

The unforgettable bestseller Wonder, now a major motion picture, has inspired a nationwide movement to Choose Kind. Now parents and educators can introduce the importance of choosing kind to younger readers with this gorgeous picture book, featuring Auggie and Daisy on an original adventure, written and illustrated by R. J. Palacio.

Over 6 million people have fallen in love with Wonder and have joined the movement to Choose Kind. Now younger readers can meet Auggie Pullman, an ordinary boy with an extraordinary face, and his beloved dog, Daisy.

Countless fans have asked R. J. Palacio to write a book for younger readers. With We’re All Wonders, she makes her picture-book debut as both author and artist, with a spare, powerful text and striking, richly imagined illustrations. Palacio shows readers what it’s like to live in Auggie’s world—a world in which he feels like any other kid, but he’s not always seen that way.

We’re All Wonders may be Auggie’s story, but it taps into every child’s longing to belong, and to be seen for who they truly are. It’s the perfect way for families and educators to talk about empathy and kindness with young children.

Praise for Wonder:
A #1 New York Times Bestseller
A USA Today Top 100 Bestseller
An Indie Bestseller
A Time Magazine 100 Best Young Adult Books of All Time Selection
A Washington Post Best Kids’ Book
A New York Times Book Review Notable Book
An NPR Outstanding Backseat Book Club Pick
An Entertainment Weekly 10 Great Kids’ Books Selection


“A beautiful, funny and sometimes sob-making story of quiet transformation.” —The Wall Street Journal

“A crackling page-turner filled with characters you can’t help but root for.” —Entertainment Weekly

“Rich and memorable.” —The New York Times Book Review

Pete the Cat Saves Christmas - Children's Stories Read Aloud - Christmas Books for Kids
By James Dean

Click here to purchase Pete the Cat Saves Christmas: https://www.amazon.com/Pete-Sa....ves-Christmas-James-

In this rockin' spin on the traditional tale The Night Before Christmas, Pete the Cat proves that giving your all in the spirit of Christmas is the totally groovy thing to do.

This updated edition of Pete the Cat Saves Christmas, a New York Times bestseller by James Dean and Eric Litwin, features a foil jacket and includes a free sticker sheet!

'Twas the day before
Christmas and Santa was ill.
In the cold winter wind he
had caught a bad chill.
Will Christmas be canceled?
Will it come to that?
"Never!" cried Santa.
"Let's call Pete the Cat!"

Pete the Cat: Meet Pete
by James Dean
Read by Let’s Read Stories

A fun new format for the youngest Pete the Cat fans: a tabbed board book!
New York Times bestselling author and artist James Dean brings us a brand-new fun format featuring everyone’s favorite groovy cat, Pete the Cat!

With 8 colorful tabs, this sturdy board book will introduce the littlest Pete the Cat fans to Pete and his super-cool group of friends, including Callie, Grumpy Toad, Gus, and more. This fun new format is perfect for even the tiniest paws!

Click here to purchase Pete the Cat: Meet Pete: https://www.amazon.com/Pete-Ca....t-Meet-James-Dean/dp

This trick for multiplication is awesome! Multiply numbers near 100 in under 5 seconds. Remember - you don't need a clickbait title to view this - you are far far better than that! Five minutes - you havre another multiplication math trick up your sleeve!

Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: teespring.com/stores/tecmath-store

Solving percent problems is easy. By using this percentage trick to easily break down the percentage into different parts, you can solve percentage problems in your head in a matter of seconds.
This trick also is explained so you will know what you are doing and have a deeper understanding of what percentages are and how to solve them.

To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Long division is not hard when you use this fast easy math method.
This long division trick will see you right!


To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

#fastmathtricks
#mentalmath
#mathtrick

Ratios are used to compare different quantities. In this introduction to ratios we will look at what ratios are, how we deal with ratios of different measurement units and that ratios can be simplified.

To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Simultaneous equations are where we work with two algebreic equations to solve unknowm variables.

To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Learn how you can square large numbers in your head - instantly! This easy to learn technique will have you calculating the square of numbers up to 100 - without the need for a calculator.
The trick is easy - first we find the distance from the number being squared to the nearest tens number. Say for example we are trying to find the square of 23 - the nearest tens number is 20, which is 3 away from 23. So 3 is our result!
We use this number to find the square - by taking this number from the number being squared (23 - 3 = 20) and then adding this number to the number being squared (23 + 3 = 26). We easily multiply these two numbers (20 x 26 = 520).
To this we add our distance number squared (3 x 3 = 9). So we add 9 to 520...our answer is 529.
Love the math!
The old math is dead! Long live the math!

To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Dividing amounts into a ratio is not only easy, it can be done quickly with only a few steps. You will be a master at this in only a few minutes through learning on the tecmath math channel!

To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

How to convert decimal to binary.

Here's the more detailed explanation:
https://www.youtube.com/watch?v=64bXbK104qk

Support us on Patreon:
https://www.patreon.com/join/tecmath To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
To support tecmath on Patreon: https://www.patreon.com/tecmath
To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

#convertbinary
#binary
#binarydecimal

How Many Faces, Edges And Vertices Does A Cylinder Have?
Here we’ll look at how to work out the faces, edges and vertices of a cylinder.
We’ll start by counting the faces, these are the flat surfaces that make the cylinder. A cylinder has 2 faces altogether - 2 circular faces, as well as 1 rectangular face.
Next we’ll work out how many edges the cylinder has, which are where two faces meet. A cylinder has 2 edges.
Next we’ll count the corners of the cylinder (the corners). No surprises, a cylinder does not have any vertices.

For the full playlist for the faces, edges and Vertices of a whole lot of 3D shapes go to https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Mixed numbers with fractions addition can be done instantly - just follow this easy method.


To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Convert any fraction to decimals with simple division.

To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

I don't want to go clickbaity, but I think only about 2% of people will be able to solve this...the rest will give up! Good luck.

To contribute on Patreon:
https://www.patreon.com/tecmath

For the playlist of math problems:
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
To support tecmath on Patreon: https://www.patreon.com/tecmath
To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

#mathproblems
#mathriddles
#mathsforfun

Most people are obsessed by the size of a car's engine, but what does an engine's capacity really mean?
In this video we'll look at engine capacity - what it is, and how it is easily worked out using the cylinder volume equation.

To support tecmath on Patreon: https://www.patreon.com/tecmath

To donate on Paypal
paypal.me/tecmath

Thanks to my Patreon Hugh for this question. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
To support tecmath on Patreon: https://www.patreon.com/tecmath
To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Why can't you divide by zero? This lesson looks at why division by zero is not allowed - not only is the answer undefinable, but seriously, if you do do it, a whole bunch of people on youtube lose it.

tecmath merch: https://teespring.com/stores/tecmath-store To support free math on Patreon (thank you): https://www.patreon.com/tecmath To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
To support tecmath on Patreon: https://www.patreon.com/tecmath
To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

This multiplication trick is really pretty obvious when you think about it.
Do you know it?

Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

Here is that link how to multiply questions like 3 x 54 instantly
https://youtu.be/yZULgerBRms


To donate to the tecmath channel:https://paypal.me/tecmath

To support tecmath on Patreon: https://www.patreon.com/tecmath

To buy tecmath mechandise: https://teespring.com/stores/tecmath-store

Surds / Radicals - the basics - multiplication made easy To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
To support tecmath on Patreon: https://www.patreon.com/tecmath
To buy tecmath mechandise: https://teespring.com/stores/tecmath-store