Without a thought for himself, he gave his lifejacket to a fellow passenger and began helping women and children into the lifeboats.

WSJ: Bookshelf: The Father of Tabloid Journalism

In March, prominent San Diego cardiologist Eric Topol tweeted "no emergency landing req'd" when he used his smartphone EKG to diagnose a distressing but not immediately dangerous irregular heartbeat in a fellow airplane passenger at 30, 000 feet.

NPR: Physical By Smartphone Becoming Real Possibility

Laura Murphy, a fellow river cruise passenger, told CNN that the ship's captain anchored the boat in Luxor after being warned against docking at any of the stops along the Nile because those areas may be unsafe for tourists.

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