"This might be related to the prevalence of carcinogens in modern societies," write Rosalie David and Michael Zimmermann of Villanova University, Pennsylvania.
That, at least, is the conclusion of a study by Patrick Markey of Villanova University, in Pennsylvania, and his wife Charlotte, who works at Rutgers, in New Jersey.
3
斯德哥尔摩大学的乔治·瓦洛蒂加拉和斯蒂法诺·葛兰达似乎通过数学模型找到了答案。
Giorgio Vallortigara and Stefano Ghirlanda of Stockholm University seem to have found the answer via mathematical models.
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