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: Skeptical Briefs newsletter
: March 1995
Reality Check
Scientific Illiteracy in the Press
Milton Rothman
I'm the first to admit it: I have not made a scientific, double- blind study of
this phenomenon. I don't know whether this is really happening. Perhaps it is
just a crotchet of advancing age. But it appears to me that the ignorance
displayed by members of the press continually grows more pronounced.
This shows up in all sorts of ways, and not just in the supermarket checkout
journals. On KYW, Philadelphia's leading radio news station, I often hear
things like: "A fire was reported in the 2800 block of West Cumberland Street,
in the Kensington section of the city." But every true Philadelphian knows that
if it is Kensington, it has to be East Cumberland Street. Clearly, their writer
is an immigrant fresh from the hinterlands and is ignorant of the city's
geography.
Headline writers are the worst perpetrators, and often behave as though they
have not read the story they are headlining. There was a recent spate of
articles in the papers about sonoluminescence, a process in which powerful
sound waves in a liquid produce air bubbles within that liquid; simultaneously
shock waves are produced inside the bubbles that heat the compressed gas to
very high temperatures. As a result, the compressed gas emits flashes of light,
as any heated gas will. Each light flash lasts less than 50 picoseconds (1
picosecond = 10 -12 seconds). The announcement of this discovery was
accompanied by a reasonable conjecture that if you used heavy water (deuterium
oxide) as the fluid, you could produce thermonuclear fusion by this method and
so generate energy.
So far so good. However, in his or her enthusiasm, the headline writer added
the word "cold" to the caption, thus creating an overheated announcement that
the experimenters had achieved "cold fusion." But the body of the story clearly
explained that the fusion reaction would occur because of the high temperatures
within the bubbles. Automatically the headline writer assumed that if it took
place in a beaker of water, it had to be cold fusion. Two kinds of errors were
involved. One, the headline writer did not read the story carefully; two, the
headline writer did not understand that even in a beaker of cold water there
can be local and temporary regions of high temperature (although it is clear
that continuous application of these high energy sound waves is going to heat
up the water pretty fast).
P.S.: Experiments are under way at Lawrence Livermore National Laboratory to do
this experiment with deuterium and to try to generate measurable neutrons.
Now let us examine a story published in a prestigious news journal: Newsweek,
dated Dec. 26, 1994. On page 108 we see an item that is a prime example of what
happens when a couple of English majors try to deal with a science- based
story. (I am assuming they are English majors, having only their ignorance of
science as evidence. Whatever happened to the idea of having science writers
who major in science and so know what they are writing about?) The article is
about powering vehicles with fuel cells, part of a series predicting the next
century. A fuel cell is described as "a sort of battery that never needs
recharging." True, it never needs recharging, but that is because it derives
its energy by oxidizing liquid or gaseous fuel. Its main virtue is touted as no
release of pollution to the atmosphere.
The falsehood lies in what is left out. We are told: "Fuel cells make possible
the dream of running a car on water: separate water into H2 and O
and, presto--car fuel." Unmentioned is the fact that to separate water into its
elements requires that you put in as much energy as you get out when you burn
the hydrogen and oxygen. And generating that initial energy is going to produce
a certain amount of pollution.
Notwithstanding, the authors end with an upbeat. After predicting unlimited and
cheap energy from fuel cells in the future, we are told: "And then fuel cells
would be even more like a perpetual-motion machine: all the electricity you
want without a speck of pollution." A schematic diagram of a fuel cell inspires
the writer to even greater heights. Its caption tells us: "A fuel cell is the
chemical version of a perpetual-motion machine." All this hype disregards the
fact that fuel cells have not the slightest similarity to perpetual-motion
machines. The defining feature of a perpetual-motion machine is that it
produces energy without burning fuel-that is, it would if it existed. But a
fuel cell burns-or at least oxidizes-fuel. Certainly if perpetual-motion
machines existed they would operate without pollution, but that is incidental
to the main point. To compare a fuel cell with a perpetual-motion machine
because they are both free of pollution is like saying a centipede is like a
lion because they both have legs.
It is clear that the authors needed some sensationalism to puff up a fairly
prosaic story. They did this by using the term "perpetual-motion" as though
this machine really exists. Actually, since perpetual-motion machines do not
and cannot exist, the comparison of a fuel cell with a perpetual-motion machine
might be taken to mean that fuel cells do not exist either. Which is not true.
Fuel cells are indeed an active area of research. They have been used for years
in space vehicles. Efforts are now aimed at using natural hydrocarbons, such as
gasoline or methane, for fuel instead of pure hydrogen. Once the price is
reduced from $2,000 to $50 per kilowatt, there are two advantages: less
pollution and greater efficiency than with internal-combustion engines. The
efficiency of heat engines is limited by the laws of thermodynamics to a low
value, while a fuel cell, which does not go through a heat cycle, can approach
100 percent efficiency. But in no way can it be likened to perpetual motion.
Now look at the obituary for Eugene Wigner that appeared in the New York Times
on January 4, 1995. Wigner was one of the 20th-century giants of theoretical
physics. His work in nuclear theory earned him the Nobel prize in physics for
1963. In describing his interest in quantum theory the obit says: "In the
ordinary world, an object either exists or does not. But quantum theory
provides that something at the subatomic level can both exist and not exist
simultaneously." I know of no textbook on quantum theory that makes such a
statement. This kind of thing is typical of certain intellectual types who say
things like: "Nothing exists until it is observed." Which I trashed in my last
column.
Quantum theory does say that the state of an object is undetermined until it is
detected, so that you might think of a photon reflected from a half-silvered
mirror as going in two directions simultaneously (the reflected wave and the
transmitted wave) until a photodetector places it in a definite location. But
that does not mean the existence of the photon is in doubt.
I'm sure, however, that this new myth will remain in circulation forever.
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