a Falsifiable/Non-Verifiable Statement needs:

• ONE observation to DISPROVE it
• ALL observations to PROVE it

for example:

• example falsifiable hypothesis: “All swans are white”
• “This swan is black” falsifies “All swans are white”

a Non-Falsifiable/Verifiable Statement needs:

• ALL observations to DISPROVE it
• ONE observation to PROVE it

for example:

• example verifiable hypothesis: “There are white swans”
• “This swan is white” verifies “There are white swans”

• Passenger pigeons are extinct
• An alien spaceship did not crash in Roswell New Mexico
• A giant white gorilla does not live in the Himalayan mountains
• Loch Ness does not contain a giant reptile

In each case, if the statement:

• happens to be false, there is evidence (at least one)
• happens to be true, all you will ever find is an absence of evidence

• Passenger pigeons are not extinct
• An alien spaceship crashed in Roswell New Mexico.
• A giant white gorilla lives in the Himalayan mountains.
• Loch Ness contains a giant reptile

In each case, if the statement:

• happens to be false, all you will ever find is an absence of evidence
• happens to be true, there is evidence (at least one)