5 SCIENCE LIES EVER
1. Things that taste good are bad for you.
In 1948, the Framingham Heart Study enrolled more than 5,000 residents of Framingham, Massachusetts, to participate in a long-term study of risk factors for heart disease. (Very long term—the study is now enrolling the grandchildren of the original volunteers.) It and subsequent ambitious and painstaking epidemiological studies have shown that one’s risk of heart disease, stroke, diabetes, certain kinds of cancer and other health problems increases in a dose-dependent manner upon exposure to delicious food. Steak, salty French fries, eggs Benedict, triple-fudge brownies with whipped cream—turns out they’re killers. Sure, some tasty things are healthy—blueberries, snow peas, nuts and maybe even (oh, please) red wine. But on balance, human taste preferences evolved during times of scarcity, when it made sense for our hunter-gatherer ancestors to gorge on as much salt and fat and sugar as possible. In the age of Hostess pies and sedentary lifestyles, those cravings aren’t so adaptive.
2:Your mind is not your own.
Freud might have been wrong in the details, but one of his main ideas—that a lot of our behaviors and beliefs and emotions are driven by factors we are unaware of—turns out to be correct. If you’re in a happy, optimistic, ambitious mood, check the weather. Sunny days make people happier and more helpful. In a taste test, you’re likely to have a strong preference for the first sample you taste—even if all of the samples are identical. The more often you see a person or an object, the more you’ll like it. Mating decisions are based partly on smell. Our cognitive failings are legion: we take a few anecdotes and make incorrect generalizations, we misinterpret information to support our preconceptions, and we’re easily distracted or swayed by irrelevant details. And what we think of as memories are merely stories we tell ourselves anew each time we recall an event. That’s true even for flashbulb memories, the ones that feel as though they’ve been burned into the brain:
Like millions of people, [neuroscientist Karim] Nader has vivid and emotional memories of the September 11, 2001, attacks and their aftermath. But as an expert on memory, and, in particular, on the malleability of memory, he knows better than to fully trust his recollections… As clear and detailed as these memories feel, psychologists find they are surprisingly inaccurate.
3. We’ve already changed the climate for the rest of this century.
The mechanics of climate change aren’t that complex: we burn fossil fuels; a byproduct of that burning is carbon dioxide; it enters the atmosphere and traps heat, warming the surface of the planet. The consequences are already apparent: glaciers are melting faster than ever, flowers are blooming earlier (just ask Henry David Thoreau), and plants and animals are moving to more extreme latitudes and altitudes to keep cool.
Even more disturbing is the fact that carbon dioxide lingers in the atmosphere for hundreds of years. We have just begun to see the effects of human-induced climate change, and the predictions for what’s to come range from dire to catastrophic.
4. The Earth is not the center of the universe.
We’ve had more than 400 years to get used to the idea, but it’s still a little unsettling. Anyone can plainly see that the Sun and stars rise in the east, sweep across the sky and set in the west; the Earth feels stable and stationary. When Copernicus proposed that the Earth and other planets instead orbit the Sun,
… his contemporaries found his massive logical leap “patently absurd,” says Owen Gingerich of the Harvard-Smithsonian Center for Astrophysics. “It would take several generations to sink in. Very few scholars saw it as a real description of the universe.”
Galileo got more grief for the idea than Copernicus did. He used a telescope to provide evidence for the heliocentric theory, and some of his contemporaries were so disturbed by what the new invention revealed—craters on a supposedly perfectly spherical moon, other moons circling Jupiter—that they refused to look through the device. More dangerous than defying common sense, though, was Galileo’s defiance of the Catholic Church. Scripture said that the Sun revolved around the Earth, and the Holy Office of the Inquisition found Galileo guilty of heresy for saying otherwise.
5. There have been mass extinctions in the past, and we’re probably in one now.
Paleontologists have identified five points in Earth’s history when, for whatever reason (asteroid impact, volcanic eruptions and atmospheric changes are the main suspects), mass extinctions eliminated many or most species.
The concept of extinction took a while to sink in. Thomas Jefferson saw mastodon bones from Kentucky, for example, and concluded that the giant animals must still be living somewhere in the interior of the continent. He asked Lewis and Clark to keep an eye out for them.
Today, according to many biologists, we’re in the midst of a sixth great extinction. Mastodons may have been some of the earliest victims. As humans moved from continent to continent, large animals that had thrived for millions of years began to disappear—mastodons in North America, giant kangaroos in Australia, dwarf elephants in Europe. Whatever the cause of this early wave of extinctions, humans are driving modern extinctions by hunting, destroying habitat, introducing invasive species and inadvertently spreading diseases.
