He was born in 287 b. C. In Siracusa, Italy. He was from Italy. His father was Phidias, an astronomer. He studied in Alexandria, Egypt. He did important discoveries, for example: The golden crown, Archimedes screw, Archimedes claw, the heat ray and wrote the first rigorous explanation of the lever. He was a physic, an engineer, an inventor, an astronomer and a greek mathematician. Are known Only some details about his life are known. He is considered one of the leading scientists in classical antiquity. He lived to 75 years old. He died in 212 b. C. In Siracusa, Italy because a soldier killed him, although he had orders was not done any harm.

Source: Wikipedia.

foto from: http://es.wikipedia.org

Dictionary Diccionari:

Screw: Tornillo.

Heat: Calor.

Lever: Palanca.

Although: Aunque.

Louis Pateur was a French scientist. He was born on 27th December 1882 in Dôle (France French). He was a teacher in the University of Strasbourg in 1847-1853. He studied in Besançon and in Paris. He discovered much many illnesses and bacterium. He won the Rumford Medal of the Royal Society(1856). He died on 28th September 1895 in Marnes-la-Coquette(France French).

Source: Wikipedia and http://www.biografiasyvidas.com/biografia/p/pasteur.htm

From: http://www.biography.com

Erik Andreas Rotheim was born on 19th of September 1898 in Kristiania. He was from Norway Norwegian. He lived in Switzerland. He was a professional chemical engineer and inventor. He invented the airsol aerosol in 1925. He was 27 years old when he invented the aerosol spray can. Erik died on 18th of September 1938.

Source: wikipedia.

Foto from http://www.aerosolverband.de/spraydose/geschichte-der-spraydose.html

He was born on 28th January 1884. He was from Switzerland. His father was Jacques Piccard. He studied in University of Basilea. He lived in Basilea. He was a teacher, explorer, physical, inventor and  mechanical. He was 53 years old when he explorer underwater exploration.

Source:Viquipèdia.

http://upload.wikimedia.org/wikipedia/commons/a/a0/Bundesarchiv_Bild_102-13738%2C_Auguste_Piccard.jpg