Unusual reaction, never fully understood, is important to fuel combustion, atmospheric chemistry and biochemistry. In all the centuries that humans have studied chemical reactions, just 36 basic types ...

Allergies are over-reactions of the immune system in certain individuals to seemingly and generally harmless foreign proteins and substances. Allergies usually do not occur at the first exposure. When ...

Bee, wasp, yellow jacket, hornet, and fire ant are the insect stings that most often trigger allergic reactions. But most people aren't allergic to insect stings and may mistake a normal sting ...

An icon in the shape of a lightning bolt. Impact Link Allergic reactions account for 200,000 visits to US emergency rooms every year, according to the Asthma and Allergy Foundation of America. Often ...