Smoke signals: The intriguing chemistry of a conclave chimney

The eyes of the world are focused on a thin chimney on top of the Sistine Chapel. Underneath, ensconced in the papal conclave, 115 cardinals are due to make their decision as to who will succeed Benedict XVI as Pope. And ...

Cardinals tweet goodbyes before conclave lockdown

Cardinals entering the Vatican ahead of a conclave to elect the next pope took to Twitter to say goodbye to their online flock before they are cut off from the outside world.

US takes its diplomacy digital

When John Kerry took to Twitter on his first day as US secretary of state, he joined an army of diplomats using social media to reach out and connect directly with people around the world.

Pope to quit Twitter after stepping down

The pope's official Twitter account, which has more than two million followers in nine languages, will close next week when Benedict XVI leaves office, Vatican Radio said Friday.

NASA briefly loses contact with space station

The International Space Station briefly lost contact with ground controllers on Tuesday because of a computer problem, but its commander said the crew was fine, NASA said.

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