Question 1
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How did Bill Gates contribute to the technological revolution during the twentieth century?

Bill gates made the computer affordable and with the window operating system brought it across to the world.

Explanation:

There were many operating systems that could be said to be better than or more effective than Windows but the fact was that Bill Gates understood hat sooner or later computers would reach the whole world.

He made the system keeping that in mind and made sure that the rates of the computers thus being sold would fall down and the system he is using would be easy for the people who do not want to use it a s a programmer but as a user.

This method changed the game of computer technology.

the crusaders are identified in the painting;

c. by the red crosses on their backs