Text: kuwait city - the capital and largest city of kuwait - travels

Correct capitalization: Kuwait City - the capital and largest city of Kuwait - travels

Text: modular design allows various limbs to be attached to enhance training

Correct capitalization: Modular design allows various limbs to be attached to enhance training

Text: i am very glad to hear that you have the prospect of being joined with mr james gregory in the professorship of mathematics at edinburgh, not only because you are my friend, but principally because of your abilities, you being acquainted as well with the improvements of mathematics as with the former state of those sciences.

Correct capitalization: I am very glad to hear that you have the prospect of being joined with Mr James Gregory in the Professorship of Mathematics at Edinburgh, not only because you are my friend, but principally because of your abilities, you being acquainted as well with the improvements of Mathematics as with the former state of those sciences.

Text: how do you use your energy?

Correct capitalization:
How do you use your energy?