You don't want flame to hit your food. Flame is bad. Flame does nasty things to food. It makes soot and it makes deposits of various chemicals that are not too good for us. The last thing you really want to see licking at your food while it's on a grill is an actual flame.
As the earth spins through space a view from above the North Pole would encompass most of the wealth of the world – most of its food productive machines doctors engineers and teachers. A view from the opposite pole would encompass most of the world's poor.
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Basically there are two things we know: Everybody has less time and the general public is demanding better food – better in terms of quality and better in terms of flavor.