Text: it does not seem possible at the present stage of the development of the electron theory to explain the magnetic properties of bodies from this theory.

Correct capitalization: It does not seem possible at the present stage of the development of the electron theory to explain the magnetic properties of bodies from this theory.

Text: this programme can be used to abdomen/back exercises on an exercise ball.

Correct capitalization: This programme can be used to abdomen/back exercises on an exercise ball.

Text: it can also lead to male infertility (live sperm that are incapable of movement).

Correct capitalization: It can also lead to male infertility (live sperm that are incapable of movement).

Text: he pored over the old testament and found it was but a code that cleared before his eyes.

Correct capitalization:
He pored over the Old Testament and found it was but a code that cleared before his eyes.