Recently they have discovered that this finding holds true all the way back to the beginning of the century.
Since the demise of the brilliant amateurs who sleuthed for their own entertainment at the beginning of the last century, diabolical poisoners with complex motives have been strictly police work.
Pier 61 is one of the Chelsea Piers, constructed at the beginning of the 20th Century.
Emily Davison became a martyr for the suffragette movement, which turned radical around the beginning of the 20th century.
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Munster likened the situation to Henry Ford and the car company he founded at the beginning of the 20th century.
The abbey church was restored at the beginning of the 20th century.
Kabuki is a Japanese traditional theatre form, which originated in the Edo period at the beginning of the seventeenth century and was particularly popular among townspeople.
Wait a minute, are these the same number crunchers who, at the beginning of the 21st century, forecast federal surpluses as far as the eye could see?
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Born in the United States at the beginning of the 20th century, jazz is rooted in African traditions, draws from European musical forms, and has evolved into various styles across the globe.
But people are thinking about cars probably for the first time since the beginning of the last century and what they need in their fleet, whether they want a car at all.
From the founding through the beginning of the twentieth century, government kept Americans free to create, innovate, and compete, to keep the results if they succeeded, and to try again if they failed.
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The idea might seem radical, but in 1930, economist John Maynard Keynes envisaged we'd be working a 15-hour week by the beginning of the 21st Century, believing that would be enough to suit our material needs.
"The crucial thing is this diamond has been in circulation certainly since the beginning of the 16th Century during which time it has been in the hands of whole sequence of different rulers, " told Radio 4's Today programme.
But the use of live ponies in a merry-go-round-style carousel, a traditional ride from the beginning of the 20th Century, is one of the less charming historical features, drawing criticism from those who see using live animals as out-dated and cruel.
On two occasions -- in the 1980s, and again at the beginning of this century -- Sioux City earnestly and formally petitioned the Federal Aviation Administration to change the letters.
We have come a long way since the notion of heroism that prevailed at the tail end of the 19th century and the beginning of the 20th.
This seemed inviolable for more than half a century, but since the beginning of the twenty-first century it has been subjected to some reinterpretation.
My sense of whirling like a dervish in making sense of the schizophrenic identity crisis of Muslims everywhere at this beginning of the 21st century is due to the current condition of the Muslim world.
Currency reform, unfortunately, is no closer than it was at the beginning of this century.
At the beginning of this century, China began taking steps to mitigate the harmful environmental impact of its rapid economic development.
But consider that since the beginning of this century, rapidly accelerating technology has shown a distinct tendency to turn the impossible into the everyday in no time at all.
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By the end of this century there will be more and more people who have less of what they need than there were seen at the beginning of this century.
The second issue is that if we continue to act in a socially uninformed and uninspired manner, some of our new social enterprises may suffer the same fate that took down so many e-businesses at the beginning of this century.
And it could be a rival to Singapore's tourist industry, which is in the throes of repositioning itself for the beginning of the next century.
Mr Quammen traces the various strains of HIV back to the beginning of the 20th century, when the virus is likely to have moved from a chimpanzee into a human.
Since the reign of Pope Pius X at the beginning of the 20th Century every pope has occupied the palatial penthouse apartment with more than a dozen rooms, staff quarters, a terrace and extensive views over the city of Rome.
This is fusion cuisine from 100 years ago, the legacy of an influx of silver miners from Cornwall to this part of Mexico at the beginning of the 20th century.
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Robert Yerkes and John Dodson worked as psychobiologists in the beginning of the previous century.
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