Yes / no, is the following a verifiable fact?
"Solon immigrated to Athens from Egpyt."

Let me think out loud. Solon was born in Athens around 630 BC. The answer is no.

Is the following statement true?
"Snohomish County, Washington located in the Pacific Northwestern part of the United States."

Let me think out loud. Snohomish County, Washington is a county in the metropolitan area of Seattle. The answer is yes.

Yes / no, is the following a verifiable fact?
"Dextromethorphan produces no side effects whatsoever in any patients who use it."
Let me think out loud. There are no drugs that have zero side effects. The answer is no.