Studies have found that most people who get the shots do not improve very much.

Why some people improve and others die is not known.

"I very much want people to take the ideas and improve on them," he said.

And can you train people to improve their leadership skills?

I used to work in a job where I'd help people improve their lives.

But since then, the people who abandoned Earth must have improved their technology.

Some people improve on a particular activity faster than others.

Later, people coming from Europe improved the making of wine.

Even in these cases, most people will improve without surgery.

The likelihood of success may be very individual - some people improve, while others do not.