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It's called a con. (condensation)trail. It's from hot exhaust gasses from the engine hitting the cold, High altitude air forming tiny water droplets.

Acetone. It lowers the surface tension of hydrocarbons. Is proven to work, and will increase the amount of fuel burned ths improving emisions as wll as fuel milage.(see previous thread)

Some say acetone works. I have read between 5 and 10% increase, but I haven't tried it myself. I think the fomula is somewhere between 3 and 2 oz per 10 gallons of fuel. Acetone is the base...

The ventury effect basically says this... When you increase velocity you decrease pressure. When you increase the velocity(decrease the pressure) at the end of a tube, it will create a preasure...

In an ideal environment... (ie. Uniform surface). No, contact area doesn't make a difference. In reality yes it does.

Well, I know it was like a Renaissance or classical piece... Not contemporary.

I am trying to find a painting I saw in the louvre back in the late 90's. I think It was in a gallery adjacent to the mona lisa. The content was of a man or woman holding a man who was mortally...