Yes / no, is the following a verifiable fact?
"Mattel created many children's television series in order to market toys.."

Let me think out loud. Barbies, bratz, monster high, are cartoons for children that function as advertisements for the toys. The answer is yes.

Is the following statement true?
"Stephen King has written and published many horror stories."

Let me think out loud. Stephen King is an author of horror fiction, who has many published books. The answer is yes.

Yes / no, is the following a verifiable fact?
"Many modern hippies and far left progressives make up the bulk of Phish's fan base."
Let me think out loud. Phish is openly progressive and promotes liberal thinking. The answer is yes.