Anti-Matter, Fuel of the future?

http://www.newscientist.com/article/dn7538-antimatter-harvester-may-fuel-future-spacecraft.html

Anti-Matter us the "opposite" of positive, or normal, matter. They share the same mass as their counterparts, although they bear the opposite charge. For example, rather than an electron; Anti-Matter has positrons, otherwise known as positively charged electrons.

Anti-Matter as fuel for space craft has been one of 12 ideas presented to NASA, and it has received $75,000 for research and development, although results may not be found for decades. However, it is possible to create anti-matter, and it has been done in laboratories and in space. Before the Big Bang, there was an equal amount of positive and anti matter, although an imbalance caused the giant explosion, allowing for more positive than anti matter to exist.

In order to be used as a fuel, the anti-matter would be mixed with positive matter, resulting in a giant explosion that would  be 300,000 times more powerful than regular energies.  In one plan, called an electromagnetic trap, would collect the anti-matter using three wire spheres. the 16 kilometer long wires would repel protons, for it would be positively charged, although antimatter would be attracted to it. In a sense, you would be fishing, although deep in space.
In order to use the antimatter, solar-sails would be used. A controlled anti-matter reaction would propel a spacecraft to pluto, with only 30 milligrams of anti-matter. And with 17 more, spacecraft could be propelled to Alpha Centauri, the nearest star to the sun. 

Reaction: This is quite the find. If such a small number of anti-matter can propell us to the nearest star, amagine how little would be needed in order to have us reach Andromeda, the nearest galaxy. However, the only issue is creating the anti-matter. Very small amounts are able to be created, although new methods are being researched. I would love to see this technology be developed upon, for there is much potential.

QUESTIONS:
1. How much money was granted towards the research?
2. How many milligrams are needed to propel us to pluto?
3. What is Anti-matter?
4. What is a positron?

5. What happens when Anti-Matter an Matter collide?