Many patients in intensive care units are being wrongly diagnosed, according to a study in a UK hospital. Some are dying because doctors fail to spot major conditions such as heart attacks, cancer and pulmonary embolism. The reason, experts say, is not incompetence but that so few post-mortems are now performed that doctors cannot learn from their mistakes.
The most distant object ever seen - a faint galaxy 13 billion light-years away - has been captured by two of the most powerful telescopes in operation.
The galaxy is seen as it was just 750 million years after the Big Bang, as the Universe was emerging from the cosmic Dark Ages. This was the murky period before the Universe's neutral hydrogen atoms were broken apart into the ions that made space transparent.
If you tend to be a little less than honest when your doctor asks you how much you drink, beware. A battery of new tests on blood, urine and hair can reveal how much someone has drunk not only in the past days, but also in the past weeks and months.
Doctors are likely to be the first to employ some or all of the new tests, to monitor patients with alcohol problems. But they are also likely to attract the interest of employers, insurance companies and forensic scientists.
Some people may be aware that a scene they are looking at has changed without being able to identify what that change is. This could be a newly discovered mode of conscious visual perception, according to the psychologist who discovered it. He has dubbed the phenomenon "mindsight".
A marijuana-based medication for people suffering from multiple sclerosis and severe pain is expected to be approved for sale in Britain early this year, British officials say.
The drug, Sativex, developed by GW Pharmaceuticals, a British company, is a liquid extract from marijuana grown by the company under license from the government. Developed to be sprayed under the tongue, it would be the first drug in recent decades to include all the components of the cannabis plant, advocates of medical marijuana say.