Teorically UU-Matter can be anything right?
Any physics addicted know that if you make matter from energy, 50% will be regular Matter and 50% will be Antimatter.
My point is, the Mass Fabricator DOES make matter from energy, so according to physics, we should get Anti-UU-Matter also. But Antimatter is VERY HARD to store, because it can't 'touch' regular Matter (when Matter collides/touches Antimatter it explodes causing 100% conversion into Energy, E=mc²) requiring it to be 'levitated' by magnetism.
So a tier 4 should have a new item capable of storing Anti-UU Matter. For this item recipe I suggest something with advanced circuit, advanced machine and a magnetizer. Other new block would be an Antimass Fabricator. Placed next to a regular Mass Fabricator, it would act like a canning machine, but with Antimatter Storage items instead of cans, resulting in Anti-UU-Matter inside a storage item.
So, what can we do with antimatter?
1. Antimatter Bomb
A kilo of Antimatter can make 9×10^16 J, that's 1000 times greater than nuclear fission and 100 times greater than fission. An antimatter bomb would be 100 times stronger than a nuke!
2. Energy Storage
We can't use antimatter for energy production, since it would produce the same amount of energy we used for making it. So it would be viable as an energy storage item. A new machine would be necessary to get the energy from antimatter without exploding the world thought.
I really can't think of any other usage for antimatter. So I think it will be denied. Anyway, thank me about the physics class
Edit: this topic is #6666 =P