Is the following a factual statement?
"Pope Leo XIII had led his Papacy with many foreign relations."
Options:
- yes
- no

Let me think out loud. Pope Leo XIII wanted to have foreign relations with man countries including Russia, Brazil and the US. The answer is yes.

Yes / no, is the following a verifiable fact?
"An Attorney at law has a professional certification to practice law."

Let me think out loud. Attorneys are trained and tested to gain their professional certificates. The answer is yes.

Yes / no, is the following a verifiable fact?
"Alfred Russel Wallace collaborated with Alfred North Whitehead to write the Principia Mathematica."
Let me think out loud. Bertrand Russell, and not Alfred Russel Wallace, wrote the Principia Mathematica with Alfred North Whitehead. The answer is no.