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Key dates in science

1936The first helicopter flight was made in Germany by the Focke Fa-61.

1938Nuclear fission was discovered by Otto Hahn and Fritz Strassman. Lise Meitner explained the discovery in 1939.

1941 Frank Whittle invented the turbojet aircraft engine in England.

1945 The USA tested the atomic bomb in New Mexico, USA, and used it on Hiroshima, Japan.

1948 Three American scientists, John Bardeen, Walter Brattain and William Shockley, invented the transistor, making miniature electronics possible.

LESSON 15.

 

Grammar. ᒺ .

ᒺ .

Text 15A.Superconductivity.

Text 15B. New Hope for Energy.

Topic.Industry in Great Britain.


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