Question: Yes / no, is the following a verifiable fact?
"Drums purify water using an advanced filtration system."

Let me think..... Drums are musical instruments, not water purification devices. The answer is no.

Question: "Operation Barbarossa resulted in flaw execution in World War I."
Is the above claim true?
Options:
- yes
- no

Let me think..... Operation was not a flaw and did not happen during World War I. The answer is no.

Question: Does the following sentence make sense?
"J. Edgar Hoover launched an investigation in to Barack Obama."
Options:
- yes
- no

Let me think..... J. Edgar Hoover died in 1972 when Barack Obama was a young child. The answer is no.

Question: Is the following sentence factually correct?
"Curtis LeMay ran every morning since he was a teenager."
Options:
- yes
- no
Let me think..... The sentence is false because there is no proof that this was the case. It is a claim that is assumed, but does not have evidence to back it up. The answer is no.