antimatter

According to quantum theory, when not observed, particles such as electrons and positrons exist not at precise points in space but rather as spread-out "clouds" of probable positions. And yet, an electron and positron will collide and annihilate as if they exist as discrete point-like...

I just came across a documentary where I learned that anti-matter actually seems to be produced in what's being referred to as 'anti-matter fountains' that is to be found close to the centre of the galaxy. There seems to be a great deal of unsolved mysteries surrounding the phenomena, though, so...