US secretary of state Hillary Clinton has left a New York hospital, three days after doctors discovered a blood clot in her head.

Doctors treating US secretary of state Hillary Clinton for a blood clot said today they were confident she would make a full recovery, after locating the damage.

For the first time, researchers are reporting that a treatment might help stabilise Alzheimer’s disease for as much as three years, although the evidence is weak and in only four patients.

A window cleaner who fell 47 storeys from the roof of a Manhattan skyscraper is now awake, talking to his family and expected to walk again.