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Yes it is :) It's just like any other form of gum, but for a different use.
That varies, between one airline and another - or, within the same airline, between one year and another.
Electro-magnetic wave. However, normal light waves reach our eyes on a variety of different planes. LASERS put all normal light waves into ONE plane. The difference with POLARISATION ( e.g. sun glasses). is that the waves in one given plane are allowed to pass. Light waves from all other planes are blocked. That is not all waves are allowed to pass.
ride in a plane. you would fly a plane
The slope of an inclined plane is found by dividing the rise of the plane by the run of the plane. also the ideal mechanical advantage.