Between 2007 and 2012, Bill Gates gave away $28 billion; saving 6 million lives.
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Steven Callahan spent 76 days at sea while he drifted 1,800 perilous miles across the Atlantic in a rubber raft, battling starvation, thirst, sharks and storms. He later became the technical adviser for the acclaimed movie Life Of Pi.
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In 2005, in Africa, it was reported that three lions rescued a 12-year-old girl from kidnappers and guarded her for half a day until help came.
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MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
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A single speck of dust is half way in size between a subatomic particle and the Earth.
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