Earth's climate and weather are tied to our food supply. And many scientists who model future climate believe that temperatures will rise and patterns of rainfall, freeze, and drought will become less certain while population increases.

Not far from the North Pole, deep in a mountain on a remote Norwegian island, is the Doomsday Vault. It will store a backup collection of the world's seeds.

Astronomers have seen more evidence of dark matter, in a massive ghostly ring 5 billion light-years away. Astronomer Dan Coe said, "Dark matter is ghostly because it's everywhere in our universe. It's all around us. But we can't see it and we can't feel it. In fact, right now there might be a billion dark matter particles passing through your body every second."

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Engineers without Borders works to build things such as systems to collect rainwater and photovoltaic solar cells to provide power in health clinics. Read more about engineering with heart.

Fluorescent proteins move from the ocean to the lab. Read more in "Glow in the Light".

Scientists believe that Earth's water was brought here early in Earth's history. They think icy comets and asteroids bombarded the young Earth for hundreds of millions of years. According to astronomer Bob Kandel the impacts heated the ices, causing them to evaporate. Eventually there was so much water vapor in the atmosphere it would have rained out onto Earth's surface.

NASA has searched for extraterrestrial life in our solar system. A 2007 report from the National Research Council recommended widening the search.

Even if you are not overweight, you should slim down to reduce your risk of cancer, according to a 2007 study by the U.K.'s World Cancer Research Fund.

As Earth becomes more urbanized, it be better off, according to George Martine, lead author of the 2007 State of World Population report. Are cities best for earth? Read more.