Every year Green Sea Turtles travel 1,300 miles across the Atlantic Ocean from their nesting grounds in the middle of the South Atlantic to their feeding grounds on the Brazilian Coast. Why do the turtles undertake this incredibly taxing journey each year?
135 million years ago, South America and Africa were a single super-continent called Gondwanaland. At this time, the turtles probably inhabited a small bay or sea, nesting on one side and feeding on the other.
Over time, a process known as plate tectonics split the continents apart at about the same rate your fingernails grow. The change was imperceptible to the turtles, who traveled a few inches farther each year out of habit until, millions of years later, they were migrating the incredible distances they traverse today.
Doesn’t the epic nature of this tale, crossing oceans of time, distance, and generations of turtles, just tickle the imagination delightfully? Isn’t this an absolutely fantastic hypothesis?
It’s also completely discredited1. We know this because the fossil evidence and geological timelines don’t match up. Sea Turtles didn’t evolve that way. Please don’t go around spreading this scientific urban legend.
The Biologist Thomas Henry Huxley, once said, “The tragedy of science is the slaying of a beautiful hypothesis by an ugly fact.” It seems like what science knows is always changing, and indeed this is the case. Every day new articles appear in peer-review journals disproving formerly established paradigms, rendering what we assumed were facts into falsehoods.
Just look at a decade’s worth of news articles on health and nutrition to see the wealth of contradictory information that field of research produces. Eat a low-fat diet. No, wait, eat a low-carb diet. Eat how many servings of meat? Dairy?
Many people characterize the mercurial nature of scientific knowledge as a weakness. Science is unstable, they argue, it claims to know the truth, but the truth doesn’t change. The fact that scientific knowledge is perpetually evolving is actually its greatest virtue, because scientists know how to admit when they are wrong.
The famous theoretical physicist Stephen Hawking published ground-breaking theories on Black Holes. Today we refer to the x-rays Black Holes emit as “Hawking Radiation” in his honor. In July 2004 Hawking acknowledge he was in error about a characteristic of black holes for 30 years.
The Biologist Richard Dawkins regularly tells the story of when he was an undergraduate at Oxford. A respected elder statesman of the Zoology Department there believed and taught that the Golgi Apparatus was not real. One day a visiting lecturer came and presented convincing evidence that the Golgi Apparatus was real. At the end of the lecture, Dawkins tells us, the elder statesman “strode to the front of the hall, shook the American by the hand and said–with passion–‘My dear fellow, I wish to thank you. I have been wrong these fifteen years.’ We clapped our hands red”2
Western Civilization once thought the Earth was the center of the Universe and that the stars, moon, and sun orbited around it. Then Copernicus, Galileo, Kepler, and other astronomers developed the theory of a Heliocentric (sun-centered) Universe. Today we know the sun orbits the center of the Milky Way galaxy, and our galaxy moves through the Universe as well. Because Science has the power to admit when its wrong, it has the power to grow and improve. Our understanding of reality grows and improves with it.
Daniel Dennet, Darwin’s Dangerous Idea, New York, 1995. (footnote on p245)
Richard Dawkins, The God Delusion, United Kingdom, 2006.
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