Allergies are an immune system reaction to substances called allergens. The cause a range of symptoms from a stuffy nose to itchy eyes to difficulty breathing. How long allergies last varies based on ...

Reaction formation is a defense mechanism in which people express the opposite of their true feelings, sometimes to an exaggerated extent. For instance, a man who feels insecure about his ...

Scientists have made an advancement in the field of electrocatalysis. Their latest research sheds light on how catalysts can stay in unanticipated forms during the process of nitrate reduction.

All chemical reactions involve an energy change. We categorise reactions by the direction of this energy change. If energy is released by a reaction, the reaction is exothermic. If energy is absorbed ...

Substitution reactions are fundamental in organic chemistry, demonstrating how molecules can be transformed into different structures. In a substitution reaction, one functional group in a compound is ...

Sarah Vine and Andrew Pierce bring their own no-holds-barred opinions, insights and reaction (clue is in the title) to the biggest stories of the week. New episodes every Wednesday, wherever you ...

Reactions to a recent immunization (vaccine) Most are reactions at the shot site (such as pain, swelling, redness) General reactions (such as a fever or being fussy) may also occur ...

When metals react with oxygen, metal oxides are formed. The speed of the reaction depends on the reactivity of the metal. Watch this video for a practical demonstration of reacting metals with oyxgen.

A change is called irreversible if it cannot be changed back again. Many chemical reactions are irreversible. In a chemical reaction, new materials are always formed. Sometimes these new materials ...

Since the advent of penicillin, humans have known about and explored the phenomenon of bacterial inhibition via antibiotics. However, with changes in the global environment and the abuse of ...