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Some congeners of the flame retardant PBDE associated with delaying time to pregnancy

PBDE's are used as flame retardants in furniture, carpeting, textiles, electronics, and plastics. Commercial mixtures of PBDE's contain a variety of congeners [see http://en.wikipedia.org/wiki/Congeners]. Data collected by the Centers for Disease Control and Prevention suggest 97% of Americans...

Does infectious disease have an adverse impact on human intelligence? A new study posits that it does.

Prior posts have noted the importance of providing clean water and sanitation services to the human population in order to lessen the impact of disease on human health and well-being. Now researchers are exploring how disease may impact human intelligence. Human intelligence is a fuzzy concept. Of...

Was humankind's first exit from Africa a failed activity?

Prior posts have noted that the accepted wisdom is that some humans left Africa about 60 thousand years ago, and thereafter migrated all over the world. Now, researchers have found stone tools at a site in the Arabian Peninsula that suggests movement some 125 thousand years ago. Many advocates for...

Humans can transmit diseases to gorillas

Prior posts have noted and described a number of human diseases that had their origin in animals. Now it appears that some diseases can be transmitted from humans to gorillas. Ecotourism has been seen as a boon for countries with "interesting" biota; it provides funding for protection of...

Common ancestor of Homo sapiens and Neandertals may have thrown spears, albeit at short range

The timeline related to when the genus homo used spears has been recently elucidated. Human ancestors were killing game about 3/4 of a million years ago in the Middle East, as evidenced by butchered deer carcasses. Until now, the earliest stone spear tips were found at a Neandertal site in France and...