Zuckerberg philanthropy effort tests uncharted waters

Following the stunning news of their $45 billion philanthropy initiative, Facebook founder Mark Zuckerberg and his wife face the challenging task of ensuring the staggering sum is put to good use.

India, Brazil resist bid for long-term carbon goals

Attempts to inscribe a long-term goal to phase out carbon emissions in an envisioned global climate pact are facing pushback at U.N. talks from big developing countries including India and Brazil.

Brazil scientists discover three new toad species

Brazilian scientists announced Wednesday the discovery of three previously unknown species of poisonous toads in the fast-shrinking Atlantic forest of southern Brazil, an area dubbed an "incubator" of new life forms.

US astronauts testify from Space Station

On his 249th consecutive day in space, U.S. astronaut Scott Kelly told Congress that what he misses most is his friends and family on Earth and the chance to experience nature.

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