Let there be light. AtD &GR again

[Mark Kohut]

for every particle of matter in the universe, there are around a billion particles of light. In other words, the universe is made almost entirely out of light.
 
http://www.guardian.co.uk/science/2012/mar/18/matter-antimatter-cern-jeff-forshaw?CMP=twt_gu
 
 
And the essential metaphysical question again, some say: Why is there something rather than nothing?