Premise:
"An article refutes the accepted wisdom that Klaus Fuchs and David Greenglass leaked the first atomic secrets to the Soviets."
Hypothesis: Greenglass and Fuchs were not responsible for secrets being divulged to the Soviets.

it is not possible to tell

Premise:
"Yours, Polly"
Hypothesis: Many Thanks, Polly

it is not possible to tell

Premise:
"Weather Update"
Hypothesis: This is the latest weather.
yes