Antarctica, Arctic 40 and 30 degrees Celsius above normal

The last few days have been 40ºC degrees warmer than normal in eastern Antarctica.

About one in seven people 60 and older have a brain condition that may be an early sign of Alzheimer's disease. The condition, called mild cognitive impairment, occupies a gray zone between normal aging of the brain and dementia. And most people know almost nothing about it.

Sinkholes as big as a skyscraper and as wide as a city street open up in the Arctic seafloor