expii

Thanks for your comments! :) We have plans to build on top of this to create a way for you to learn an entire "course" of topics. That's our next stage of development.

For now, we're happy to share the Topic Map as it is of independent interest. :) We hope that it might be helpful for people who are either already at a topic area within a course, or just like exploring maps.

Thanks for your feedback! All feedback is really useful to us, as it helps us to continue to polish the product. The articles themselves are crowd-sourced, and they certainly show signs of being a community that is still growing. It's possible to create richer articles like this one: https://www.expii.com/t/gravity-weight-642

The main point of our post tonight was to share the current product of the Topic Map. As the rest of the site continues to grow, we hope that you will soon learn about it as a useful resource.

Regarding the split of Algebra 1 and Algebra 2: we fully agree that math should be more connected. We actually experimented with that here, in the "Theory" section of "Math". You can find that by clicking into "Algebra Revisited", which you can also find by first going here:

https://www.expii.com/t/2829

and then clicking on "Topic Map" to see a fully connected version of Algebra. This is much more theoretical though, and does not align so easily with standards used in mainstream schools. We chose to make the main sections of our maps align with standards so that they could be more immediately useful for the mainstream audience. However, we ourselves are a bunch of enthusiasts who love to think about how to push the envelope. :)

Expii uses voting (like Reddit, Quora, Stack Overflow, etc) to identify the best content. After that, since we have the luxury of focusing only on the "heavy-hitter" topics which at least 100 million people need to know, there really aren't that many topics. When we do reach the size at which quality is an issue, we can simply moderate the topics in-house.

Wikipedia cannot do this because their objective is to cover 100 million topics (breadth), and so in-house moderation doesn't scale. Our objective is depth: we ultimately want to provide the absolute best free interactive lessons on every heavy-hitter topic in the world. :)

Thanks for your well-wishes!

Thanks for noticing! :) Indeed, I've been working with a certain segment of the population through my roles as the national coach of the USA IMO team and as a math professor at Carnegie Mellon University.

However, after being appointed to the national coach position, I realized that the USA would not be able to consistently deliver top results unless we lifted our mathematical level across a broad base. It seemed that technology could provide the solution to that problem, in the sense that it's possible to crowd-source the scripting of automatic virtual tutors, which can then be replayed (for free) on mobile devices throughout all regions, rich or poor. Thus, expii.com was born.

https://www.youtube.com/watch?v=11SdySDDrMk https://www.youtube.com/watch?v=t6WVbFIz43M

-- Po-Shen Loh