In which decade was the first solid state integrated circuit demonstrated?

Who is the English physicist responsible for the 'Big Bang Theory'?

Who invented Braille script?

Electric lamp was invented by:

Who invented Aeroplane ?

This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.

Roentgen invented:

What James Watt invented?