A single oral dose of a drug that is already being used to treat a type of blood disorder could also improve our memory suggests new research. The researchers found that single dose of the common inexpensive and safe chemical called methylene blue results in an increased response in brain areas that control short-term memory and attention. Methylene blue is used to treat methemoglobinemia a blood disorder in which oxygen is unable to release effectively to body tissues and as a surgical stain. Although the memory-enhancing effects of methylene blue were shown in rodents in the 1970s the underlying neuronal