The document discusses different criteria for determining whether something is real. It states that something is real if it has been recorded through research, providing the example of electrons being discovered in 1897. Another criterion is if something has been experienced, like friendship or dreams. A third way for something to be real is if it cannot be seen physically but is known to exist, such as marriage. Finally, the document argues something is real if it is not physical but was invented by humans, providing evil as an example, or if it can be moved around physically, such as chairs.