My father is an excellent doctor.

His strong will led him to success.

His intention was clear.

A neutron is part of an atomic nucleus.

Neutron stars are known for their density and strong gravity.

He is as stubborn as a head as hard as a stone.

This soil is lacking in lime, so it is necessary to add lime.

He works digging out coal.

What is his real name?

He was living alone in a small stone hut in the mountains.