skade88 writes: From the article 'Is the nature of a vacuum really fixed? Not so, according to two forthcoming papers. Researchers have identified a quantum level mechanism for interpreting a vacuum as being filled with pairs of virtual particles with fluctuating energy values. They've also discovered that physical constraints, such as the speed of light and the so-called impedance of free space, are indications of the total number of elementary particles in nature.'
Never ask two questions in a business letter. The reply will discuss
the one you are least interested, and say nothing about the other.