Catalysis, nanoparticles: hydrogen peroxidePhoto courtesy of Dr. David J. Willock, Cardiff Universityin chemistry, the modification of the rate of a chemical reaction, usually an acceleration, by addition of a substance not consumed during the reaction.
The United Service Organizations Inc. (USO Show) is a nonprofit organization that provides programs, services and live entertainment to United States service members and their families.
Diffen âº Finance. The US dollar (USD) is the official currency of the United States and the de facto currency for international trade and a reserve currency for much of the world. The Euro (EUR) is the currency of 22 European countries, including 17 countries in the European Union.