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1EVLC7

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Ed posts 2 words and 1 question mark, then has to edit it???

He also has a new tag line :lol

Uh oh......that's my fault!

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It's daylight, sun brightly shining, hardly a cloud in the sky. I can count all of the planes flying overhead by their contrails.

Why do planes leave contrails?

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It's daylight, sun brightly shining, hardly a cloud in the sky. I can count all of the planes flying overhead by their contrails.

Why do planes leave contrails?

Vapor trail, by-products of the exhaust crystalize...Just like our Vehicles do in the winter.

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It's daylight, sun brightly shining, hardly a cloud in the sky. I can count all of the planes flying overhead by their contrails.

Why do planes leave contrails?

Vapor trail, by-products of the exhaust crystalize...Just like our Vehicles do in the winter.

The nature and persistence of jet contrails can be used to predict the weather. A thin, short-lived contrail indicates low-humidity air at high altitude, a sign of fair weather, whereas a thick, long-lasting contrail reflects humid air at high altitudes and can be an early indicator of a storm.

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The answer is: Pi.

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.

The Pi Song

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