Text: some of the leading questions are:

Correct capitalization: Some of the leading questions are:

Text: prometheus was the mythic figure who stole fire from the gods and gave it to human beings so they could progress.

Correct capitalization: Prometheus was the mythic figure who stole fire from the gods and gave it to human beings so they could progress.

Text: the end point of the hiv infection is often a mixture of various diseases, this is called aids.

Correct capitalization: The end point of the HIV infection is often a mixture of various diseases, this is called AIDS.

Text: the accommodation is located in the born area, close to the chocolate museum and palau de la musica catalana.

Correct capitalization:
The accommodation is located in the Born area, close to the Chocolate Museum and Palau de la Musica Catalana.