Classify whether the following sentences are opinions or facts:
1. The Eiffel Tower is located in Paris.
2. Pizza is the best food in the world.
3. Water boils at 100 degrees Celsius at sea level.
4. Cats make better pets than dogs.
5. William Shakespeare was born in 1564.
1. Factual
2. Opinion
3. Factual
4. Opinion
5. Factual