The most sad video

Never I saw so sad video about the car accidetnts, like this one.
If you watch it with attention, you'll be forever better driver.
There are milions of cars involved in accidents every day. There are million injury cases and car accident deaths. According to the World Health Organization about 3000 people die in crashes each day worldwide. Car accidents affect nearly everyone. Nearly all drivers who had had an accident did not believe themselves to be to blame. But is this the truth ? Look at this video - it could be you on it....

Wonderful World shadow puppet

It is absolute a real show - it was performed in the Great British Variety Performance in 2007

Designed by shadow

A shadow is an area where direct light from a light source cannot reach due to obstruction by an object. It occupies all of the space behind an opaque object with light in front of it. The cros

section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light.
An astronomical object casts human visible shadows when its apparent magnitude is equal or lower than -4. Currently the only astronomical objects able to produce visible shadows on Earth are the Sun, the Moon and, in the right conditions, the planet Venus.

The farther the distance from the object blocking the light to the surface of projection, the larger the silhouette (they are considered proportional). Also, if the object is moving, the shadow cast by the object will project an image with dimensions (length) expanding proportionally faster than the object's own length of movement. The increase of size and movement is also true if the distance between the object of interference and the light source are closer. This, however, does not mean the shadow may move faster than light, even when projected at vast distances, such as light years. The loss of light, which projects the shadow, will move towards the surface of projection at light speed.
The projected shadow may appear to have moved faster than the speed of light, but there is no actual physical manifestation moving upon the surface. The misconception is that the edge of a shadow "moves" along a wall, when in actuality the increase of a shadow's length is part of a new projection, which will propagate at the speed of light from the object of interference. Since there is no actual communication between points in a shadow (except for reflection or interference of light, at the speed of light), a shadow that projects over a surface of large distances (light years) cannot give information between those distances with the shadow's edge.