ISSUE:

Hello, good afternoon, I saw that there is another website that I think you also have, it is similar to this one, but with a .net domain,

what is the difference between them?

What forum is more active? All the best!

Hellooooo!
That page originally had a forum, but it was abandoned and now the link redirects to it.
The first organic page that I uploaded to the internet, back in the year 2000, was completely handmade, it only had a style sheet and programming a forum for it was very complex. That's why I abandoned it and started working on this one that works with a content manager. Later I was sorry to have abandoned the original and I migrated its content to another manager.
At the moment they are two very similar pages, although once you complete the basic organic chemistry content for them, they may go in different directions.
I send you a greeting!