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Summary: A new study shows mixed planting can greatly boost maize yields. Nigel Williams reports. [ABSTRACT FROM AUTHOR]

Summary: The UN is stepping in to help protect Africans from wealthy countries leasing agricultural land in many states on the continent. Nigel Williams reports. [Copyright &y& Elsevier]

Summary: Conservationists are fighting to protect the key breeding site of East Africa''s iconic lesser flamingos. Nigel Williams reports. [Copyright &y& Elsevier]

Western Europe is seeing a growing number of cases of H5N1 flu in wild birds that have migrated from the east, but new outbreaks in poultry in Africa threaten the hordes of birds heading north for the summer breeding season. Worries about the disease are likely to grow. Nigel Williams reports. [Copyright &y& Elsevier]

A new series of grants bolsters efforts to develop new approaches to counter major diseases of poorer countries, writes Nigel Williams [Copyright &y& Elsevier]

HIV/Aids may have the highest profile of health problems in Africa but a major new attack on malaria is needed if new international efforts to bolster the continent’s economies are to have any major long-term impact. Nigel Williams reports. [Copyright &y& Elsevier]

Humans have been enormously successful in exploiting a range of sounds used in language, but none more so than the click consonants used by a few populations in eastern and southern Africa. New research suggests these click languages represent an ancient human language. Nigel Williams reports. [Copyright &y& Elsevier]

Reports of substantial evidence for genetic linkage of schizophrenia to chromosome 1q were evaluated by genotyping 16 DNA markers across 107 centimorgans of this chromosome in a multicenter sample of 779 informative schizophrenia pedigrees. No significant evidence was observed for such linkage, nor for heterogeneity in allele sharing among the eight individual samples. Separate analyses of European-origin families, recessive models of inheritance, and families with larger numbers of affected cases also failed to produce significant evidence for linkage. If schizophrenia susceptibility genes are present on chromosome 1q, their population-wide genetic effects are likely to be small.