FOSS gamedev and creative worlds

Hi miners )
Here http://minetest.com/ I saw feature "Dynamic Lighting (light up caves like minecraft)".
What is it means ?

Now (v.0.4.14) caves seems absolutelly dark )

And is really Minetest-c55 the "old" name of minetest ?

First, Minetest official site is at http://www.minetest.net/ . Seems like you saw old non-official site maintaned by other people.

"Dynamic lightning" there means if you are in a cave then it'll be dark until you place some light source, a torch for example. That text already removed in new Minetest page.

Yes, it was called Minetest-c55 because the founder of this game is c55.