Example: People other than you claim to be sentient. You have no direct access to their first-person experience, and are incapable of coming up with a falsifiable method of testing for its existence. How can you know they are sentient?
Philosophical answer is that you can't, really. Provided you want to remain in the realm of localism, materialism, etc. (variously known as "science" and "common sense"), however, you could just measure the energy output of a television and the energy output of wireless router and stop worrying about how nothing is certain.
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Example: People other than you claim to be sentient. You have no direct access to their first-person experience, and are incapable of coming up with a falsifiable method of testing for its existence. How can you know they are sentient?
Philosophical answer is that you can't, really. Provided you want to remain in the realm of localism, materialism, etc. (variously known as "science" and "common sense"), however, you could just measure the energy output of a television and the energy output of wireless router and stop worrying about how nothing is certain.