Understanding the differences between physical and chemical changes is the basics in the study of chemistry. These two types of transformations describe how substances can change in terms of their ...

Hormonal treatments administered as part of the procedures for sex reassignment have well-known and well-documented effects on the secondary sexual characteristics of the adult body, shifting a ...

Why are climatologists so highly confident that human activities are dangerously warming Earth? Members of the IPCC, the 2007 peace winner, write on climate change Editor's note: This story was ...

New research examines the chemistry of a proposal to curb climate change's effects -- creating a sunshade in the upper atmosphere made of sulfuric acid -- and finds that there's more work to do to ...