On the Cover
May-June 1998 Volume 86, Number 3
Counting a population can be a deceptively difficult task. In fact, even
the first director of the U.S. Census, Thomas Jefferson, recognized
that some persons were likely missed in the 1790 enumeration. Two
centuries later, more than 4 million people went uncounted, and the net
undercount was particularly high among minorities—despite promotions in
numerous languages, such as a poster in Spanish and English that was
adapted to form this issue's cover. ...
Established statistical methods can reduce net undercounting of the population if they are allowed
A 240-year-old theorem helps explain how people and machines can integrate auditory and visual information to understand speech
An unusual feature of the female nine-banded armadillo's reproductive tract may explain why her litters consist of four genetically identical offspring
Chemical interactions can lead to unusual arrangements between species
Clouds in the summer sky provide clues about the organization of star populations
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A review of 2025: Scenarios of US and Global Society Reshaped by Science and Technology, by Joseph F. Coates, John B. Mahaffie and Andy Hines.
See all book reviews for this issue.