Scientists have come to some surprising
conclusions about the world and our place in it. Are some things just
better left unknown?
The consequences of burning fossil fuels are already
apparent. We have just begun to see the effects of human-induced
climate change.
(AlaskaStock / Corbis)
By
Laura Helmuth
smithsonian.com
(Continued from page 1)
4. 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. 5. E=mc²
Einstein’s famous equation
is certainly one of the most brilliant and beautiful scientific
discoveries—but it’s also one of the most disturbing. The power
explained by the equation really rests in the c², or the speed of light
(186,282 miles per second) times itself, which equals 34,700,983,524.
When that’s your multiplier, you don’t need much mass—a smidgen of
plutonium is plenty—to create enough energy to destroy a city.
6. 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.
7. We’re all apes.
It’s kind of deflating, isn’t it? Darwin’s theory of evolution by
natural selection can be inspiring: perhaps you’re awed by the vastness
of geologic time or marvel at the variety of Earth’s creatures. The
ability to appreciate and understand nature is just the sort of thing
that is supposed to make us special, but instead it allowed us to
realize that we’re merely a recent variation on the primate body plan.
We may have a greater capacity for abstract thought than chimps do, but
we’re weaker than gorillas, less agile in the treetops than orangutans
and more ill-tempered than bonobos.
Charles Darwin started life as a creationist and only gradually came to realize the significance of the variation he observed in his travels aboard the Beagle. For the past 151 years, since On the Origin of Species
was published, people have been arguing over evolution. Our ape
ancestry conflicts with every culture’s creation myth and isn’t
particularly intuitive, but everything we’ve learned since then—in biology, geology, genetics, paleontology, even chemistry and physics—supports his great insight. 8. Cultures throughout history and around the world have engaged in ritual human sacrifice.
Say you’re about to die and are packing some supplies for the
afterlife. What to take? A couple of coins for the ferryman? Some
flowers, maybe, or mementos of your loved ones? If you were an ancient
Egyptian pharaoh, you’d have your servants slaughtered and buried
adjacent to your tomb. Concubines were sacrificed in China to be eternal
companions; certain Indian sects required human sacrifices. The Aztecs
slaughtered tens of thousands of people to inaugurate the Great Pyramid
of Tenochtitlan; after sacred Mayan ballgames, the losing team was sometimes sacrificed.
List of countries and islands by first human settlement Map of human migration , based on studies of mitochondrial (matrilinear) DNA. Though fossils of hominids have been found dating back millions of years, the earliest known Homo sapiens remains are considered to be a group of bones found at the Omo Kibish Formation , near the Ethiopian Kibish Mountains. Though believed to be 130,000 years old at their discovery in 1967, recent studies have dated them as far back as 195,000 years old. [1] From this area, humans spread out to cover all continents except Antarctica by 14,000 BP . According to a recent theory, humans may have crossed over into the Arabian Peninsula as early as 125,000 years ago. [2] From the Middle East , migration continued into India around 70,000 years ago, and Southeast Asia shortly after. Settlers could have crossed over to Australia and New Guinea – that were united as one continent at the time due to lower sea levels – as early ...
Michael Wardian trail running in Marin, California Photograph by Tim Kemple, The North Face By Kate Siber Next: "Barefoot" Running Tips >> Runner Michael Wardian is a master of both road and trail running, with more than 150 marathons, 60 ultramarathons, and 20 triathlons under his belt. He has been the leading member of the U.S. 100K world championship team and has won races from the 50K North Face Endurance Challenge to marathons in San Francisco, Miami, Delaware, and Washington, D.C. He also holds the Guinness World Record for the fastest marathon run in a superhero costume, which he clinched as Superman in the 2011 Lower Potomac Marathon. 1. TRAIN FOR TRAILS Trail running takes a different skill set than jogging on roads, but it’s not hard to learn. “A lot of people say the only way to get good at running on trails is to run on trails, but a lot of us don’t l...
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