The attack on the Christmas market in the German city of Magdeburg has sparked a strong reaction across the Arab world. Several Arab countries, including Saudi Arabia and Qatar, were quick to ...

Background: Rising use of sunscreen products has led to increased reporting of adverse reactions to sunscreens. Objective: To investigate possible photoallergic reactions in patients who ...

A video about the energy changes involved in chemical reactions, whether exothermic or endothermic.