Chemist Cites Advance in Stem-Cell Field

Scientists have reprogrammed mature skin cells into an embryonic-like state by using proteins instead of genes, a key advance aimed at overcoming safety concerns in one of the hottest areas of biological research.

Now, instead of reprogramming the cell with four introduced genes, researchers have achieved the same result by inserting four proteins associated with those genes. This technique is deemed to be safer because it doesn't require genetic manipulation.

Monkeys Think, Moving Artificial Arm as Own

Two monkeys with tiny sensors in their brains have learned to control a mechanical arm with just their thoughts, using it to reach for and grab food and even to adjust for the size and stickiness of morsels when necessary, scientists reported on Wednesday.

The report, released online by the journal Nature, is the most striking demonstration to date of brain-machine interface technology. Scientists expect that technology will eventually allow people with spinal cord injuries and other paralyzing conditions to gain more control over their lives.

The findings suggest that brain-controlled prosthetics, while not practical, are at least technically within reach.