Ketamine is a licensed medical drug, widely used as an anaesthetic and to relieve pain. But it is also used as a recreational drug and can lead people into addiction.
The researchers said constant use of satnav would probably have longer-term limiting effects, making users less able to learn and navigate a city’s street network unaided.
The annual healthcare and lost productivity costs for those made ill from smoking are estimated at around $1 trillion.
Researchers have found that some one in five cases of tuberculosis, a bacterial infection, are now resistant to at least one major anti-TB drug.
The study found a “weaponisation” of healthcare in Syria in which people’s need for it was used against them by denying access.
WHO said that the pathogens have built-in abilities to find new ways to resist treatment and can also transfer genetic material that allows other bacteria to become drug-resistant.
Drug resistant malaria superbugs have appeared in parts of Thailand, Laos and Cambodia and are threatening to undermine all progress made against the disease.
Experts who carried out the studies found that medicine and healthcare are routinely both over- and underused, causing avoidable harm and suffering and wasting precious resources.
According to the report, malnutrition– either undernourishment or obesity– is responsible for nearly half of all deaths of children under five worldwide and, together with poor diets, is the number one driver of disease.
The work, covered in two studies published on May 4 in the journal Nature and Nature Cell Biology, showed how the cells that will eventually form the human body self-organise into the basic structure of a post-implantation human embryo.
Stopping transmission of the contagious viral disease that has infected millions is possible within a year, experts say.
A new WHO study shows that the number of adults with diabetes has quadrupled worldwide in under four decades and the condition is becoming a major problem in poorer countries.