Aerodynamics, from Greek ἀήρ aer (air) + δυναμική (dynamics), is a branch of fluid dynamics concerned with studying the motion of air, particularly when it interacts with a solid object, such as an airplane wing. Aerodynamics is a sub-field of fluid dynamics and gas dynamics, and many aspects of aerodynamics theory are common to these fields. The term aerodynamics is often used synonymously with gas dynamics, with the difference being that "gas dynamics" applies to the study of the motion of all gases, not limited to air.
Formal aerodynamics study in the modern sense began in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag have been recorded much earlier. Most of the early efforts in aerodynamics worked towards achieving heavier-than-air flight, which was first demonstrated by Wilbur and Orville Wright in 1903. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed the scientific basis for ongoing developments in heavier-than-air flight and a number of other technologies. Recent work in aerodynamics has focused on issues related to compressible flow, turbulence, and boundary layers, and has become increasingly computational in nature.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien. Regardons autour de nous
On vit dans un monde de fous
Chacun cherche sa gloire,
Chacun cherche l'espoir.
On oublie ce qui nous entoure
Ceux qui nous donnent de l'Amour
On chasse de notre memoire
Ce qui nous empeche d'y croire.
On laisse au bord du chemin.
Les chagrins sans lendemain,
On poursuit chacun sa route.
On laisse au bord de la route
Chacun tous ses petits doutes,
On poursuit son chemin. Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
Tenir au creux de ses mains
Les clefs de notre destin,
Mener a la victoire
Tous nos reves d'un soir.
Et on court apres le temps
On passe a cote des gens,
On court apres l'argent,
On se cache, on se ment.
Meme si la solitude
Est notre seule attitude,
On garde en chacun de nous
L'Amour de ceux qui nous aime,
Meme si on a de la peine,
On se retrouvera.
Meme si la realite
N'est pas notre verite,
On continue a y croire
A se battre pour notre histoire.
Meme si le prix a payer
Est plus cher a chaque fois,
On continue a y croire
Des espoirs pour nos espoirs.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
Chacun pense a soi
Comme si il n'y avait que ca,
Chacun mene a bien
Que ce qu'il veut bien.
…
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"EVERYONE THINKS ABOUT THEMSELVES"
Everyone thinks about themselves
As if they were the only ones,
Everyone sees it through
Just what they really want to do
Everyone thinks about themselves
As if they were the only ones,
Everyone sees it through
Only what they really want to do
Let's look around us
We live in a crazy world
Everyone seeks some glory,
Everyone seeks some hope
We forget all the things around us
Those who give us love.
We dismiss from our memory
Everything that stops us believing.
We leave by the edge of the path
The short-lived sorrows.
Everyone, follow the road
and leave by its edge
every last doubt
And carry on walking.
Everyone thinks about themselves
As if they were the only ones,
Everyone sees it through
Just what they really want to do
Everyone thinks about themselves
As if they were the only ones,
Everyone sees it through
Only what they really want to do
Holding in our hands
The keys of our destiny
Leading to victory
Our one night's dreams.
And we run after time,
We turn away from people,
We run after money,
We hide and lie to each other
Even though loneliness
Is our unique attitude,
We keep to ourselves
The love of those who love us,
Even though we feel upset,
We will meet up again.
Even if reality
Is not our truth,
We keep on believing,
And fight for our history.
Though the price to pay
Is more expensive each time,
We keep on believing
A few hopes for our new hopes.
Everyone thinks about themselves
As if they were the only ones,
Everyone sees it through
Just what they really want to do
Everyone thinks about themselves
As if they were the only ones,
Everyone sees it through
Only what they really want to do