Artillery research prerequisites missing?

[Infidellic]

Searched and couldn't see an obvious topic on this. Not necessarily a bug but thought I'd bring it up for discussion.

Summary
You can research Artillery, and therefore have access to make artillery shells, without having researched the components that are required to make an artillery shell (namely: explosives and explosive cannon shells)

Suggested fix
Add "Explosives" and "Tanks" as prerequisites to "Artillery" in research. Along the same thought train "Tanks" should also have "Explosives" as a prerequisite due to Explosive Cannon Shells requiring explosives.

Discussion
I can't think of many other places where you can research items which require tech which you've yet to research. From a new user's perspective it's not obvious where to find the research required for items sometimes unless the name is obvious. Open for discussion

[Rseding91]

Thanks for the report however this is intentional. It keeps the technology graph from being a giant web of lines.