Yes / no, is the following a verifiable fact?
"Martha Washington became president of the United States."

Let me think out loud. There has never been a female president in America. The answer is no.

"Singing a Lullaby can soothe babies."
Is the above claim true?
Options:
- yes
- no

Let me think out loud. Many studies have shown that listening to music has a distracting and calming effect, when used appropriately. The answer is yes.

Is the following statement true?
"The Hulk actually premiered before Iron Man officially starting off the Marvel Cinematic Universe."
Let me think out loud. The Hulk was released early 2008 while Iron Man was released that summer. The answer is yes.