The aspirin is the most known drug and the most used in the world. It is a cheap, safe and effective pill.
He was born in Scotland, he received his doctorate in medicine and he taught himself to speak well to people with problems with hearing. In one of his experiences noted that, when speaking in front of a thin layer of metal, it vibrated in a way very similar to the voice. By placing the membrane around an electromagnet, the electric flux could repeat what you had said, and could be transmitted by an electric cable.
The first plants could accommodate a few subscribers. The terminal operator entered the cable from the caller to contact with someone, the one hand, and the contact that is called in another.
The phone has evolved until the current mobile phones. At first there were phones only in places specialized, then they came to the houses and now they can be transported where you want.
By Olga Caballer :)
Clocks are instrument that measure the time. A watch a mechanism that oscillates at a constant rate, either a pendulum, a spring or a crystal. The search for accuracy and less weight was a constant in the job of Watchmakers. If we discard the atomic clocks and timers, the quartz watches were an accurate revolution on a ancient technology.
The quartz clock was preceded by many other watches, such as the hourglass of the Middle Ages, the water clock or clepsydra used until the Middle Ages, a sundial used by the Egyptians before 1500 BC and the mechanical clock that appears in Europe in 1300. And, of course, pocket watches and wristwatches that appeared in 1504, but they are seen as luxury until in 1868 he invented the first winding watch.
And finally I think that my favourite brand watches is Tissot
Life had never been as it is now, and it never will be the same as it was....Many inventions have taken several centuries to develop into their modern forms. Each invention may be just one small step on the road to the ultimate goal.
The television was a really big revolution in the communications of that time. This world has become smaller because of the ability to be everywhere that something happens, and its power in society is so strong that it says what is in fashion and what you have to say or think to millions of television viewers. What is more: our free time can’t be thought of without television.
No one can grant, in the topic of the television, who was the inventor of this gadget but we can talk about the people who intervened in this invention:
One of them was Paul Nipkow, who patented in 1884 a system to break down the light in different little points. After ten year the cathode rays were invented by Ferdinand Braum.
The first American star of the television was Félix cat. His adventures were looked in 1928 in all TV shows.
The fist play that was shown on television was “The man with the flower in the mouth” by Pirandello, in 1930.
The first program broadcast on the international television was the coronation of Queen Elizabeth II in 1953.
1949 was the year in which the shadow mask tube was developed. It is the beginning of the television with colours. The television broke borders when it started to use satellites of communication to send and receive pictures transoceanic. Finally in 1969 the pictures with the arriving of the man to the moon were seen live on televisions of all over the world.
All the rest we already know. Television has become so much better, with better screens and better quality and colours, and it has become so small that we can look at this in a common mobile phone but it has become so big too that we can look at this as if we were in the cinema watching a film.
At the moment almost everybody has a minimum of one or two high definition television at home. But I sometimes think about what it would happen if we were our parents when they were 5 or 6 years old, most of them didn’t have this gadget… Maybe they were happier than us now…maybe not.
Personally I'm not sure about if it has been the most appropriated invention or the worst substitute to the innocence of the children.
For curious people here you have a link: TELEVISION
By Teresa R. B.
The radio is a communication method that sends sound signals by radio waves.
It’s really hard to claim this invention to only one person, but officially it is claimed to Guglielmo Marconi, a Bologna (- Long waves travel to
- Medium waves can travel around a hundred km. (they are used by national and local radio stations).
- Short waves can travel thousands of km. (they are used by international radio stations).
HISTORY
- In 1924, Radio Barcelona is created, the first Spanish transmitter.
- In 1932, Edwin Armstrong invents frequency modulation that minimizes interferences.
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- 1988, first car with radio.
Today. radios are used for listening to the news, music or other programs. Everybody has one, on our mobile phone, Mp3 or in our cars. But in the past it was really hard to have a radio.
The toothbrush was first introduced in Europe in the seventeenth century.
A combination between chemistry and optics, trying to get more clear images gave place to photography.
The plane is the means of transport with fewer accidents and much faster than any other medium. The first flight led and driven over a device heavier than air was conducted in North Carolina in 1903 by the Wright brothers.
