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

Who invented Braille script?

Who invented the BALLPOINT PEN?

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.

When was barb wire patented?

Who invented Fountain pen?

Roentgen invented:

What J. B. Dunlop invented?

When was the first elevator built?

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