Is It Liver Pain Or Something Else reclaim land from the sea

In the field of "scientific things that escape me because of my letter formation was quite high at the top the theme" how to hold a plane in the air. " Until recently he could understand, I do not know by what process, a normal plane does not crash (as a rule). Recently, on a flight CITY - Paris, I sat beside a French engineer, I always get cool people on the planes, which was kind enough to explain why a two-story Boeing also fell. The air is heavy, and has mass. Then the engine power counteracts the tonnage of the aircraft, provides the right impetus and thus moves on the air. The wings, it seems, are pretty key, because they make the plane "will pose" on the air mass and not fall. Má