Common human brain cells can morph into different cell types - and further, these cells can be made to produce large amounts of new brain cells in culture, potentially creating a source of cells.

The scientists still don't know specifically what the gene does. But they know that this same gene turns on in human fetuses at seven weeks after conception and then shuts down at 19 weeks.

Advertising agencies go beyond - way beyond - the focus group to scan people's brains to determine how they respond to advertisements. They then use that information to design "better" ads.