A number of marine organisms are poisonous to humans. These can be divided into those which are poisonous when eaten and those which are venomous, either stinging or injecting poison. Ciguatera poisoning is caused by eating fish which have consumed toxic algae which colonise damaged coral reefs. Herbivorous fish graze on the algae, which is [...]

At different times we all experience nervous tension of some degree, and we are all familiar with the more obvious signs of anxiety. However, there is a multitude of ways in which anxiety may manifest itself, and some of these are of such a nature that they often mislead both patient and doctor into the [...]