One of the major reasons that science is held in low repute among portions of the citizenry is that it has too often allowed itself to become entangled with public relations. The PR connection has nothing to do with peer review, that essential element in the scientific method. The PR connection has to do with institutional politics, funding, and personal ambition.
What happens is this:
1. Some scientists publish a report of their work.
2. An alert PR guy who works for the university or institute notices some potentially hype-able words in the report.
3. He writes up a release, under the impression that he is Arthur C. Clarke.
4. J-school grads at a number of media outlets, whose science education ended in 8th grade, pick up the release, change three words to make it their own, and it is published to an unsuspecting public.
5. The unsuspecting public, which is not as dumb as the PR guy believes, dismisses the story as bushwah and blames the scientists.
Here is a dandy example. The Journal of the American Chemical Society has recently published a paper titled “Evidence for the Likely Origin of Homochirality in Amino Acids, Sugars, and Nucleosides on Prebiotic Earth.” No non-chemist would get beyond the seventh word.
Here’s what the original paper is about. (I am no chemist, but among the formulae and jargon there are patches of intelligible English. I welcome anyone to correct my interpretation.) Many of the compounds that make up organic life exist in mirror-image forms. This is called chirality. So, amino acids, sugars, and other things can have right-handed (D) or left-handed (L) forms. On Earth, almost all living creatures incorporate L amino acids and D sugars. Since, purely as a chemical matter, either form is equally probable, the question arises, why is Earth’s life so strongly biased? We are immediately in the realm of conjecture. Of course, this is fine for science, which begins in “maybe” and proceeds by way of evidence to “probably.”
What is the evidence? Well, there isn’t much, really. Some meteorites found in Australia contained compounds with a slight bias in favor of what is found on Earth. Why might that be? Well, it has been shown that circularly polarized light of just the right directionality and wavelength can produce such a bias. And so the author of the paper tells us:
If there was also [yet undetected] right circularly polarized light with energy in the uv or higher irradiating the asteroid belt when the amino acids were present on a particle that later came to Earth, this could account for the small excesses of the L anantiomers seen in the α-methyl amino acids.
Or not. The key words in that sentence are “if” and “could.” It’s pure speculation, with no foreseeable possibility of being confirmed or disconfirmed. Again, this is not a bad thing in science. Speculation like this points out areas for active investigation.