Yes / no, is the following a verifiable fact?
"The second 'Ndrangheta war raged from 1975 to 1980 for five-years."
no
The six-year war between the Condello-Imerti-Serraino-Rosmini clans and the De Stefano-Tegano-Libri-Latella clans, during 1985-1991, led to more than 600 deaths.

"Hamburgers are a popular dish in the USA."
Is the above claim true?
Options:
- yes
- no
yes
They are served in many restaurants and eating establishments across the USA.

Is the following a factual statement?
"Akira Kurosawa released over 30 films that he directed."
Options:
- yes
- no
yes
Akira Kurosawa directed 30 films in his 57 year career.

Yes / no, is the following a verifiable fact?
"Willard Van Orman Quine wrote postmodern philosophy."
no
Willard Van Orman Quine was a logical positivst philosopher, a polar opposite.