Yes / no, is the following a verifiable fact?
"Joseph Hooker resigned from United States Army, when General Halleck and Lincoln declined his request for reinforcements."

Let me think out loud. Hooker was kept in command and served Army till 1868. The answer is yes.

Is the following sentence factually correct?
"The Northern elephant seal lives in Canada, as well as the U.S. and Mexico."
Options:
- yes
- no

Let me think out loud. Wikipedia confirms the northern elephant seal lives in those places. The answer is yes.

Is the following statement true?
"The Samsung Galaxy S II competes with Apple iPhones."
Let me think out loud. Samsung Galaxy S II and Apple iPhone are two of the most popular phones. The answer is yes.