This is my biggest mod I am making yet, the Periodic Table Mod! My goal, is to add every element that is currently on the periodic table, that is not already in the game. I do not plan to finish till 1.3 or later, because of the modding API support. Currently, there are only about 150 block ID's, and there are 118 elements on the periodic table. So in 1.3, when you can use block ID's above 256, I will try to finish this. This might not be compatible with all other mods, because the block ID's might be used. This does require ModLoader. To install, just drag everything from the Periodic Table Mod Folder that you get, and drag them into minecraft.jar. Be sure that META-INF is deleted. So far, this mod adds hydrogen and helium ores, bubbles, tanks, and tools so far. What happens, is you find the ore, you get bubbles, because these are gasses, and when you combine the bubbles with a cooling tank, you get a tank of the gas. Then, you can make them into tools. If you like the ore a lot, just craft 9 bubbles in the crafting table to get the ore back. I warn against it though, as you only get one bubble from the ore, and it takes 9 to make it. Remeber, subscribing and diamonding and favoring gets the updates out faster! Just note, I have to learn Forge to finish this, so the updates might come slow. And, since the updates are coming row by row, I have to add like 17 elements each update. This will take a while.