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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.

Author: May, Robert M.
Publisher: Scientific American, Inc.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1992
Methods, Measurement, Identification and classification, Biological diversity, Biodiversity, Taxonomy (Biology), Biology, Numerical taxonomy

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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.

Author: May, Robert M., Nowak, Martin A., Sigmund, Karl
Publisher: Scientific American, Inc.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1995
Models, Cooperation (Economics), Cooperation, Prisoner's dilemma game

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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.

Author: May, Robert M., Anderson, Roy M.
Publisher: Scientific American, Inc.
Publication Name: Scientific American
Subject: Science and technology
ISSN: 0036-8733
Year: 1992
Health aspects, Usage, Statistics, Mathematical models, Africa, AIDS (Disease), Zidovudine

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