Archaeologists in Leicester reveal an unexpected tobacco imprint on our skeleton ... scientists were able to observe chemical modifications in smokers. This more precise method could change ...

However, this new research demonstrates that chemical modifications in bones can now serve as a reliable indicator of tobacco consumption, even when dental evidence is absent. Dr.

plants transform it into useful compounds through a series of chemical reactions that happen in multiple parts of the cell and reduce the photosynthetic efficiency by up to 50 percent. To recover ...