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A review of the Khan Academy website. Watch short videos that cover many subjects, that explain concepts in a great and easy to understand conversational manner.

Khan academy

(External Link)

  • A not-for-profit organisation with the mission of providing a world-class education to anyone, anywhere
  • The Khan Academy is all about using video to explain the world, with the work focussed on creating a good experience for students
  • They place deep understanding of content above anything else
  • Videos cover chemistry, organic chemistry, physics, maths, biology, history, economics

What the website offers:

  • Over 1800 videos, it is easily the most exhaustive collection of instruction on the internet
  • Learners can fill in almost any of their "gaps" from class with the content on this site
  • The content is in 10-20 minute videos especially made for viewing on the computer
  • Great conversational style of the videos – not what people expect when receiving maths and science instruction
  • You can access exercises by logging in – if you have a Gmail or Facebook account you simply sign in with these when prompted after clicking on“do exercises” at the top of the page. You can watch the relevant video and then attempt to complete the exercise, and submit your answer online

Classroom use

  • The videos do not follow a curriculum
  • The author believes that someone who truly understands the core concepts will thrive academically regardless of the curricularcontext
  • Because of the granular nature of the 10 minute videos, the content can be mapped to almost any state's or nation's standards
  • Khan Academy videos can be downloaded and saved to a flashdrive

Teacher and user comments

  • I think resources like the Khan Academy have a lot more potential in higher ed than things like lecture capture systems. I’d much ratherhave my students watch a few of these videos before class, then work through more problems and questions with me during class... I would imagine that many ofmy students would get more out of these videos than they would reading the textbook. I can’t see these kinds of videos replacing classroom instruction, butfor giving students first exposure to topics and for providing them with reinforcement after class – yeah, they’ve got lots of potential. (External Link)
  • I saw the piece on this wonderful teacher on PBS. Most of us strive to create an environment where the learner can be exposed to a variety ofexplanations about the phenomena we study. These certainly would be part of that mix as long as we fully credit the importance of the author's/teacher's work toour students. One day, we will hopefully teach ourselves out of our jobs (External Link)
  • I am now in college and learning more than I ever have in my life. But an inadequate math background has been holding me back. I found theKahn Academy in June of 2009, right after I completed Math 141 ( a college algebra course). I have spent the entire summer on your youtube page. And I justwanted to thank you for everything you are doing. You are a Godsend. Last week I tested for a math placement exam and I am now in Honors Math 200. No questionwas answered incorrectly. My placement test holder was so impressed by the breadth of my knowledge of math that he said I should be in Linear algebra. Mr.Khan, I can say without any doubt that you have changed my life and the lives of everyone in my family. I wish you and the Khan Academy the best of luck. (External Link)

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Physics - open resources and tools. OpenStax CNX. Jun 02, 2011 Download for free at http://cnx.org/content/col11308/1.3
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