As far as I'm concern science is stimulus to progress. If there had not been science, people would have sat around the fire and slept on the bare ground.  Exploring of space, for example, has changed our life in many and somewhat unanticipated ways.

As we have seen many times in history, science explorations bring unanticipated results.  For instance, Columbus didn’t find a shorter route to Asia, but he discovered new continents!

They say, the science is a stimulus to progress; and  It’s  truth . So  it’s difficult to overestimate the role of science in our life. ...

But every medal has its reverse. The rapid scientific progress has aroused a number of problems that are a matter of our great concern.

These are ecological problems, the safety of nuclear power stations, the nuclear war threat.

In spite of all these things  science  progress cannot be and will not be stopped. Science will go on -- whether we are pessimistic, or are optimistic.

“Do not worry about things you cannot change.” said  Benjamin Franklin  I And  I completely agree with this view.