Yes / no, is the following a verifiable fact?
"Starbucks offers customers a free drink on their birthday."

Let me think out loud. If a customer signs up for the rewards program, they can redeem a free birthday drink. The answer is yes.

Is the following statement true?
"There are book, ebook, and audiobook versions available of The Hitchhiker's Guide to the Galaxy."

Let me think out loud. The Hitchhiker's Guide to the Galaxy is a novel adaptation of a radio series, first published in the 1970s. The answer is yes.

Claim: "Upton Sinclair wrote nearly 100 books and other works in several genres."
Is the claim above correct, and can it be verified by human common sense and without a web search?
Options:
- yes
- no
Let me think out loud. The sentence is true because there are physical books that he wrote available publically for people to read. His name is on the cover of these books. The answer is yes.