Green fluorescence shows redox reactions in living Synechococcus cells. Scientists have charted a significant signaling network in a tiny organism that's big in the world of biofuels research. The findings about how a remarkably fast-growing organism conducts its metabolic business bolster scientists' ability to create biofuels using the hardy microbe Synechococcus, which turns sunlight into useful energy.

Here are three scanning electron micrographs of laser-irradiated turkey cartilage, recorded from different perspectives and with different magnification. It was the day after Thanksgiving in 1981, and like most others across the nation, Rangaswamy "Sri" Srinivasan, a researcher at IBM's Thomas J. Watson Research Center in New York, had brought some turkey with him to work. The difference between Srinivasan and everyone else was that the scientist had no plans to eat the leftovers.