Question: Yes / no, is the following a verifiable fact?
"There are still dinosaurs in the Galápagos Islands who are huge and vicious."

Let me think..... Dinosaurs went extinct 65 million years ago and only a hand full of creatures like alligators were around during those times. The answer is no.

Question: Is the following statement true?
"Achilles only had one vulnerability in one of his heels."

Let me think..... According to the legend, Achilles was invincible because he was dipped in the river Styx, but the heel that he was held by was not invincible. The answer is yes.

Question: Is the following statement true?
"You can still find Copper in modern houses today."

Let me think..... Using copper pipes in plumbing is popular in America. The answer is yes.

Question: Yes / no, is the following a verifiable fact?
"Zoroastrianism was founded based on the teachings of the prophet Zoroaster."
Let me think..... This is considered the origin of this religion. The answer is yes.