Mars and Europa appear to be best suited for life. Will greater understanding of what makes planets habitable by microbes lead to the discovery of life on other worlds?

Exploring how to feed a population that grows by 80 million each year, and changing the course of global agriculture as it is known today.

New research suggests that high cholesterol creates heart danger that can change the normal heartbeat, and lead to sudden death.

Ashok Gadgil is known for his inventions, that can provide clean, cheap water for a thousand people, and a cooking stove for families in Darfur.

California's future as a food producer for the rest of the U.S. is tied to its water, particularly to the fresh water supply in the Sacramento-San Joaquin Delta, says Jeff Mount. Mount said over time, the levees have weakened and the ecosystem has declined - and the state will have to make difficult choices to restore the delta.

The newly launched tower in Spain has over 1,200 mounted mirrors that follow the sun's path throughout the day. The heat energy from the sun powers a steam turbine to generate electricity, and can be stored for later use, says Mark Mehos.

Matt Wilson was able to gain insights to the structure of memory, it seems to be composed of short segments, compressed and replayed in fractions of seconds.

Dee Boersma said penguins can't find food as easily because of the effects of warm water on the fish they eat. Warming ocean temperatures, she said, have altered sex ratios in some populations of the fish they eat, creating more males.

Dr. Thomas Karl told EarthSky that the large-scale burning of fossil fuels by humans amounts to treating our planet like a giant laboratory.

Larry Kazmerski says that enough solar energy beams down on Earth to power all that we do, so we need ways to convert it.