What is tsunami?

The Japanese word tsunami makes reference to an enormous wave formed by a tremor of earth or a volcanic eruption.  At the outset the height of tsunami is very small but it can become an enormous water wall that reaches the sixty meters of height.

What bird has thousand pulsations per minute?

Although it is a tiny bird, the colibrí or bird fly has an enormous heart that annoys thousand times every minute.  Some of the 338 species of colibríes can arrive to fly over the 15,000 feet of altitude and to shake their wings 200 times per second.

Since when is spent the summer?

The displacements of leisure during the summer were put fashionable between the bourgeoisie in the middle of century XIX, Thomas Cook invented them.  This Briton began to organize excursions and the first legal decree was promulgated in France in 1936.

Which is material the more duro of the world?

The false belief that exists material the more duro of the world is the diamond. Then no, therefore it demonstrated French chemistry to it Pham Houng.  He and their colleagues of the university of Bordeaux have identified a material still more duro than the diamond: the diamita.

Since when the women use trousers?

Amelia Bloomer, feminist outstanding in the United States, designed in the middle of century XIX, a skirt until the knee on wide trousers, but this first attempt did not prosper.  At the end of that century trousers began to be used to take a walk in bicycle, but until 1920 they did not begin to be used to mount to horse. Nevertheless it was during World War II, when the trousers happened to be an article clothing more.

The mechanism by which a submarine can sail by the surface and also to submerge and to do it by the marine bottom is very simple.   It is constructed with a system of camera between an outer wall and another made inner wall with special materials that prevent the penetration of the water.   In order to submerge it is not necessary it more to fill of water the camera that there is between the walls. Thus, the weight causes that the submarine sinks. In order to raise the surface, it is only necessary to fill the air chamber.