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Could humans have been influencing climate as long as 15 thousand years ago?

When someone mentions "climate change" and people, most of us think about the start of the industrial revolution. Those with a more anthropological viewpoint will think about the advent of slash-and-burn agriculture some 8 thousand years ago. Now, some serious researchers have had some fun...

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...

Another BPA issue -- it may cause undesirable activation of estrogenic genes

Prior posts have followed the debate over BPA and its potential problems. In a recently reported study, researchers have raised a new issue, the activation of estrogen-related genes. Exposure of animal and cell models to doses of BPA below the recommended tolerable daily intake (TDI) of 50 µg...

Have past blood tests for BPA been faulty? Recently published study so claims

Prior posts have noted in detail the results of various studies of the impacts of BPA on various test media (e.g., animals). Prior posts have described the ongoing public debate over BPA and its listing and then delisting as a reproductive toxicant under California's Proposition 65. A recent post...