The weather. Tomorrow, expect a biting cold front. Hmm, how naughty. I wonder what I'll be

wearing or taking off. The night will be wild and untamed. Expect heavy, lashing rain

that'll soak you to the skin. By Monday, temperatures will rise slowly but surely reaching

their peak in the afternoon.

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Have you ever noticed those little white spirals in the center of airplanes' engines and wondered what they are?

They aren't just there to look cool. They actually have a very important purpose.

Let's investigate the real purpose of jet engine spirals.

You're listening.

You're listening.

You're listening.

You're be amazed. The spirals I'm referring to can be seen right in the middle of the turbines painted on the aerodynamically shaped cones which cover fan blade mounts and jet engines.

Many of the biggest plane engine manufacturers have been painting spirals on them for decades, and the

practice actually dates all the way back to World War II when spirals were often painted

on the propeller cones of fighter jets.

The benefits of the spirals are actually twofold.

The primary reason is for the safety of the ground crew, to give the maintenance team a visual

sign that the engines are running. Even when engines are only running at idle power, their pull is still extremely strong,

so the danger zone of a Boeing 737 is 9 feet around each engine.

When the engines are running above idle power, this area increases to 14 feet.

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