Over the last two hundred years, there have been many changes to society in nearly all aspects of people’s lives. Medical science has advanced beyond recognition and it can be argued that this has been the most significant change.
The last two centuries have witnessed great advances of the industrial revolution. Automation, machinery and various technologies have revolutionised the way people live, work, play and travel. Society has now many things that make people’s lives easier and more enjoyable, including cars, planes, computers and telephones to name only a few. It is quite clear that these advances are phenomenally significant in most people’s lives today.
Medical science has also been revolutionised. The three principal challenges facing surgery, which were pain, infection and bleeding, have all been overcome, allowing the lives of millions to be saved. The discoveries of vaccines to deal with the great killer diseases of history also took place over the last two centuries. Probably billions of people who would have died from diseases such as smallpox, tuberculosis, diphtheria and tetanus have all been saved.
In addition to this, medicine now has such an advanced knowledge of human body systems that doctors can cure or heal a wide range of ailments that would in the past have been fatal or extremely debilitating. It is also likely that the next century will see similar significant advances.
In conclusion, although there have been many different advances in society over the last two hundred years, the fact that so many people have had their lives saved or improved by medical breakthroughs makes it seem incontrovertible that it is these medical advances that have been the most significant. 
Over the last two hundred years, there have been  
many
  changes
 to society in  
nearly
 all aspects of  
people’s
  lives
. Medical science has advanced beyond recognition and it can  
be argued
 that this has been the most  
significant
  change
.
The last two centuries have witnessed great advances of the industrial revolution. Automation, machinery and various technologies have  
revolutionised
 the way  
people
  live
, work, play and travel. Society has  
now
  many
 things that  
make
  people’s
  lives
 easier and more enjoyable, including cars,  
planes
, computers and telephones to name  
only
 a few. It is quite  
clear
 that these advances are  
phenomenally
  significant
 in most  
people’s
  lives
  today
.
Medical science has  
also
 been  
revolutionised
. The three principal challenges facing surgery, which were pain, infection and bleeding, have all  
been overcome
, allowing the  
lives
 of millions to  
be saved
. The discoveries of vaccines to deal with the great killer diseases of history  
also
 took place over the last two centuries.  
Probably
 billions of  
people
 who would have  
died
 from diseases such as smallpox, tuberculosis, diphtheria and tetanus have all  
been saved
. 
In addition
 to this, medicine  
now
 has such an advanced knowledge of human body systems that doctors can cure or heal a wide range of ailments that would in the past have been fatal or  
extremely
 debilitating. It is  
also
 likely that the  
next
 century will  
see
 similar  
significant
 advances. 
In conclusion
, although there have been  
many
  different
 advances in society over the last two hundred years, the fact that  
so
  many
  people
 have had their  
lives
 saved or  
improved
 by medical breakthroughs  
makes
 it seem incontrovertible that it is these medical advances that have been the most  
significant
.