Lunch Hour Lectures have been running at University College London since 1942.  It's terrific to know that even at the height of World War II, British citizens wanted to learn about the latest science in an informal setting.

Scheduled for today, the first one for the 2010-11 season has (well, had?) professor of genetics Steve Jones on ... incest. 
New research suggests that walking at least six miles per week may protect brain size and in turn, preserve memory in old age. 

For the study, 299 dementia-free people recorded the number of blocks they walked in one week. Then nine years later, scientists took brain scans of the participants to measure their brain size. After four more years, the participants were tested to see if they had developed cognitive impairment or dementia.