Facts are statements that can be checked and backed up with evidence, such as the fact that Lionel Messi was named the FIFA World Footballer of the Year in 2010, or the fact that dolphins live in schools or pods of up to 12 individual dolphins. A fact is something that is known to exist or to have happened and is a truth or reality.The word "fact" comes from the Latin word "factum", which means something done or a deed. It was created in 1530-1540. Facts differ from opinions. Opinions are based on a view or belief held by an individual. Opinions cannot be checked and are not based on evidence. An example of an opinion would be to say that dolphins are the best animals in the world. That is an opinion of one person, but it cannot be proven that dolphins are the best animals in the world. In some professions, facts and opinions are mixed such as writing. When reading anything written, always make sure to check the sources to differentiate the facts from the opinions.Here are some additional examples of facts: According to UK government national statistics, approximately one in five people in the UK in 2004 were aged under 16. Dolphins use a blowhole on top of their heads to breathe, and they use echolocation for finding the specific location of objects.