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...human baby grows into an adult by digesting and metabolising food and drink. The parents in each case pass to their progeny, or offspring, the information and specification for building cells from materials around them. This information lies in the genetic material, or DNA, which is found in the chromosomes within the nucleus and which is transmitted from generation to...

...humans) whereby each iris is a distinctly different colour, such as having one blue iris and the other brown. But this isn’t why Bowie’s eyes looked different. Instead, the unusual appearance of Bowie’s eyes were due to a condition called anisocoria. Anisocoria is a condition characterised by an unequal size in a person’s pupils. In Bowie’s case, his left pupil...

...human activities such as small-scale gold mining. It persists in the environment, no level of exposure is safe and mercury poisoning is incurable. Most at risk are people who eat fish and shellfish that contain high concentrations of methylmercury (the organic form of mercury), and people regularly exposed to high levels of the element through their work. Contamination...