One key reason is that cities, as they evolve, naturally spread out.

FORBES: Megacities And The Density Delusion: Why More People Doesn't Equal More Wealth

In food equipment as in any environment where microorganisms can occur naturally or be spread by contact, it is essential to follow proven steps for cleaning and sanitizing.

CNN: Soda fountains contained fecal bacteria, study found

He said there was always a potential for this ladybird to spread quite naturally.

BBC: NEWS | UK | Northern Ireland | Hunt on for 'deadly ladybird'

The bankers were only doing what comes naturally to bankers-trying to profit on the spread between the cost of money and what they can charge.

FORBES: It ain't over yet

From neighbors and small grocery stores word spread of Niman's tasty, naturally raised meat to chefs like Chez Panisse's Alice Waters, the doyenne of California cuisine.

FORBES: Magazine Article

Word spread fast that Tom had been laid off and naturally Benny was the guy to go down there.

NPR: Excerpt: 'Then We Came to the End'