via scienceblogs.com
When you want to do something, it takes energy. Where does that energy come from? From the ATOMS!! and Molecules.
How much more efficient? If I had a million pounds of hydrogen, and I fused the entire million pounds into helium, how much would turn into energy, and how much would turn into (helium) waste? I'd get about 7,000 poundsworth of energy (which, by E=mc2, is a lot, but I'd still get 993,000 pounds of waste. 0.7% efficiency isn't so great, all things considered.But that's where antimatter comes in. [...] if I brought a million pounds of fuel on board -- 500,000 pounds of hydrogen and 500,000 pounds of antihydrogen -- I'd get perfect efficiency: 1,000,000 pounds worth of energy and no waste.And that's why creating and trapping neutral anti-hydrogen is such a big deal![...], we can store an arbitrarily large amount of it for as long as we want.
from http://scienceblogs.com/startswithabang/2010/11/why_making_neutral_antimatter.php (follow the link for full article)
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