How many species inhabit the earth?
Article Abstract:
The total number of animal, plant and other species must be known to develop a program for conserving biological diversity. Even though systematic research on species has been in progress for more than 250 years, estimates of total species vary from three million to 30 million, an extremely large range.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1992
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The arithmetics of mutual help
Article Abstract:
A model is used to demonstrate how cooperation could possibly arise and be maintained in actual biological systems. It is shown that repeated interaction could draw sophisticated creatures to follow cooperative strategies.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1995
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Understanding the AIDS pandemic
Article Abstract:
Mathematical models mirror the infection patterns and transmission trends demonstrated by the AIDS virus. The models can also help determine the effectiveness of medications such as AZT.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1992
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