Simply reading the mod the name, you might guess its name; The CoolThings Mod introduces a new way to make Obsidian. All you have to do to make Obsidian is putting a water bucket onto a lava bucket and voila. There are 2 blocks of Obsidian in your inventory.
Of course, that not all. The mod also features two guns and a new sword, a new block and especially a new material known as Polymer. Just simply smelting white wood in furnace, you get this material. 9 Polymer in a crafting table make a Block of Polymer, and vice versa.
These are the major things that the mod adds so far:
I will add more, which will happen soon since this mod is now in 1.0! The versions prior to this one were just the beginning of what this mod will feature! So be sure to kee up on any updates!
To install, you need to go into the .zip file and move the .jar file that is in there to your mods folder. Make sure you have Forge for 1.7.10.