It only gives the positive values because logarithms only deal with positive numbers (in the set of real numbers anyway).
It's like asking why |x| always equals a positive.
Oh, and don't say 'Why aren't there any transitionary organisms!' because ALL organisms are transitionary organisms.
It's not like it was a bird and then POOF! it's a fish or something.
That's silliness; chemistry's entire remit is within the role of physics, whereas physics deals with much more than chemistry.
If you notice, there's shared elements between biology and (chemistry and physics), yet some elements are seperate; these are more behavioural areas, which we cannot explain through physical law as of yet.
We can explain all of chemistry through physical law.
To quote Richard Feynman, 'All these rules (talking about chemistry; things such as the periodic nature of the elements) were ultimately explained in principle by quantum mechanics, so that theoretical chemistry is in fact physics.'
That tends to be a railgun similar to the one the cambridge engineering department have on open days; it deals with solid projectiles of magnetic elements, rather than clumps of charged particles.
It also isn't very long (6m for a particle accelerator is nothing).
etc etc etc.
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