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Can you identify this function? http://bit.ly/KApiece
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Elaine Oliveira Vieira's profile photoChau Tu's profile photoT Hickson's profile photoMark Edwards's profile photo
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h(z)
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What three tiny particles hold the secret to life itself? Our partner, Crash Course, investigates: http://bit.ly/CrashChem
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Bo Landsem's profile photoEmma Galbraith's profile photoDana Wissmiller's profile photoSwapnil Das's profile photo
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yay!
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Learn how to combine HTML/CSS with JavaScript to make your web pages interactive in our new course: https://khanacademy.org/html-css-js
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Richard Manyama's profile photoSofia Cruz's profile photoTimAndAnnMarie Bond's profile photoBrett Ellibee's profile photo
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this might be interesting
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How do these lines relate to each other? http://bit.ly/LinesKA
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Grayson Kendall's profile photoNitin Seshadri's profile photoKevin Moy's profile photoJennifer Anderson's profile photo
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(⌒.−)=★
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Happy 206th birthday, President Lincoln! Learn how the US passed the "Reconstruction Amendments." From our partners at the Aspen Institute. http://bit.ly/13thKA
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Abibatou Diarra's profile photoAnu S's profile photoJavier Naveiro's profile photoKevin Huynh's profile photo
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Good
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When will this system of equations have no solutions? http://bit.ly/SysEqKA
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me too?????????????????
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Have them in circles
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Can you save Paris from an alien invasion? http://bit.ly/KAtrigalien  
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Ravi Dudhagra's profile photoCoral Ong's profile photoJennifer Anderson's profile photoAbheek Ranjan Das's profile photo
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80.53°
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Please spend <1 min to vote for Khan Academy in Reddit's giving back campaign. Today is the last day to have your vote count: http://bit.ly/KARedChar
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Adrian Vrabie's profile photohasini Indran's profile photoDavid Sullivan's profile photoDarryl McClain's profile photo
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Nice idea
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The Europeans who dug up this Aztec sculpture in 1790 were so freaked out that they decided to bury it again. Check. It. Out. bit.ly/Coatlicue 
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+Sean Rhoades OMG !
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This Valentine's Day, explore Cythera, the birthplace of Aphrodite, the goddess of love. http://bit.ly/Cythera
​Antoine Watteau, Pilgrimage to Cythera, 1717, oil on canvas, 4' 3" x 6' 4 1/2" (Louvre, Paris).  oil on canvas, 4' 3" x 6' 4 1/2" (Louvre, Paris). ​Speakers:  Dr. Steven Zucker & Dr. Beth Harris
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Good
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What do you think is the purpose of life? http://bit.ly/AristotleKA
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Wooooooow 
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Are you a high school student who wants to help guide Khan Academy's new SAT prep? Apply to join our Student Advisory Board: http://bit.ly/KASATForm
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Still got to finish this term before I'll be in High School, but yeah, I'd love to!
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Have them in circles
648,511 people
Barbie Chiquititas's profile photo
Maria Elena Rodriguez Beltran's profile photo
alexander castro villegas's profile photo
Debora Helena de Rezende Rodrigues's profile photo
Brookfield Village's profile photo
Nazli Naseri's profile photo
Natalie Norman's profile photo
adriana sanchez's profile photo
Fred Poole's profile photo
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A free world-class education for anyone anywhere
Introduction

The Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere.

Our resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy's materials and resources are available to you completely free of charge.