1. Its the oldest fossil in the creation.
2.Its the coldest thing in the universe.
3.It carries with it a 'baby photo' of the universe.
4.It accounts for about 99.9% of all the particles of light ,or photons ,in the universe.
5.Its in the air around you - even in the room where you are now.
6.Its discoverers mistook it for the microwave 'glow' of pigeon droppings.