Manchester City trimmed Arsenal's lead at the top of the Premier League table to two points with a 3-0 win over Sunderland at the Etihad. The Gunners were beaten 2-1 by Aston Villa in the lunchtime ...

Reaction kinetics and dynamics refers to the study of why, how and how fast chemical processes take place. Chemists seek to understand the details of change at the molecular and quantum level and how ...

An allergic reaction happens when the immune system overreacts to certain substances, causing symptoms like hives or difficulty breathing. Severe allergic reactions, called anaphylaxis, can be ...