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1 .This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?
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2 .Forty years ago yesterday, November 24, 1974, paleoanthropologist Donald Johanson found in Ethiopia what's arguably the most famous and important fossil of a human ancestor: Lucy.
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3 .Last month, at the ScienceWriters2014 meeting in Columbus, Ohio, Johanson talked about the moment he laid eyes on Lucy.
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4 ."On that eventful day in 1974 I was out, with a graduate student, Tom Gray, and we were walking back to our Land Rover to go back to camp to enjoy a swim in the river with the crocodiles and enjoy a nice little lunch.
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5 .And I am always looking at the ground.
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6 .I find more quarters by parking meters than anybody I know, I think.
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7 .And you know how it is you find what you're looking for, right?
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8 ."Because a year before the discovery a geologist had left his footprints four-to-five feet away from the skeleton, because he was looking for rocks.
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9 .I was looking for bones.
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10 .And I found a little piece of elbow, that little hinge that allows us to flex and extend our arm.
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11 .And I knew from my studies of osteology, of comparative anatomy and so on, that this had to be from a human ancestor.
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12 ."And I as looked up the slope, I saw other fragments eroding out.
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13 .And we recovered over a two-week-long excavation operation roughly, not counting hand and foot bones, 40 percent of a skeleton.
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14 .And this was important because first of all it broke the three-million-year time barrier.
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15 .All the fossils older than three million years at that point in the history of paleoanthropology would fit in the palm of your hand.
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16 .we didn't know it was a new species really until a few years later when we finally published in 1978 the name Australopithecus afarensis."
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17 .For more, check out the blog item on our website by Scientific American's Kate Wong, who, with Johanson, co-authored the book Lucy's Legacy.
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18 .Kate's blog is titled The Fossil That Revolutionized the Search for Human Origins: A Q&A with Lucy Discoverer Donald Johanson.
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19 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Steve Mirsky.
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