Some Postclassic Questions About the Classic Maya

Some unanswered questions about vaccination.

I pondered for several months over what I should write for this 100th Volume of FEMS Microbiology Letters before deciding that it might be useful to pose some questions about vaccination for which there seem to be no adequate answers. Although I have put these questions verbally to colleagues over several years, I thought that by putting the same questions in writing, it would not only help to ...

Some Questions About The Evolution of Morality

Richard Joyce has written an admirable book, brimming over with fascinating findings, bold empirical hypotheses and philosophical arguments that are both innovative and provocative, all set out in a straightforward, engaging style. One of the virtues of this journal’s book symposia that they give commentators an opportunity to ask questions that authors can address in their responses. But sympo...

Classic Period collapse of the Central Maya Lowlands: insights about human-environment relationships for sustainability.

The ninth century collapse and abandonment of the Central Maya Lowlands in the Yucatán peninsular region were the result of complex human-environment interactions. Large-scale Maya landscape alterations and demands placed on resources and ecosystem services generated high-stress environmental conditions that were amplified by increasing climatic aridity. Coincident with this stress, the flow of...

some questions about herbal and traditional medicine

Some combinatorial questions about polynomial mappings

The purpose of this note is to show how recent progress in non-commutative combinatorial algebra gives a new input to Jacobian-related problems in a commutative situation. @ 1997 Elscvier Science B.V. 1991 Math. Subj. Class.: 13B2.5, 13810, 14A05