The topic of allergies has become routine in our lives, and certainly most everyone has an idea of what an allergy is. An allergy is an abnormal reaction by a person's immune system against a normally harmless substance. A person without allergies would have no reaction to this substance, but when a person who is allergic encounters the trigger, the body reacts by releasing chemicals which cause allergy symptoms.
Definition of eisteddfod. plural. eisteddfods. play \Ä«-Ësteth-ËvoÌdz, Ä-\ or. eisteddfodau. play \Ä«-Ësteth-ËvoÌ-ËdÄ«, Ä-\. : a usually Welsh competitive festival of the arts especially in poetry and singing.
The number e is a mathematical constant that is the base of the natural logarithm: the unique number whose natural logarithm is equal to one. It is approximately equal to 2.71828, and is the limit of (1 + 1/n)n as n approaches infinity, an expression that arises in the study of compound interest.