Which sentence states a fact?
Thomas Edison's inventions are more interesting than Nikola Tesla's. Thomas Edison invented the phonograph.
A fact is something that can be proved to be true. Facts can be proved by observing, measuring, or studying information.
The flag of the United States has 13 stripes.
This is a fact. It can be proved by looking at the flag and counting the number of stripes.
An opinion is something that a person believes, thinks, or feels. An opinion cannot be proved true.
The flag of the United States is easy to draw.
This is an opinion. People may have different opinions about what makes a flag "easy" to draw.
The second sentence states a fact.
Thomas Edison invented the phonograph.
It can be proved by reading a biography of Thomas Edison.
The first sentence states an opinion.
Thomas Edison's inventions are more interesting than Nikola Tesla's.
More interesting shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes something interesting.