Is science the only way to knowledge?

[Jackalope]

Seriously, how do you test the hypothesis that you're not a brain in a vat? That your cognitive faculties are working properly? That everyone around you are actual people instead of p-zombies?

That's a vacuous argument with no utility.

...and equally applicable to himself. No, shit, we can neither prove nor falsify solipsism? Really? What an intellect you have there, Vinny.

Note to all the readers out there - when someone plays THIS card, you've won - because they just committed intellectual suicide and declared that (with solipsism in play) that they in fact cannot know anything beyond the existence of one's own consciousness. Congratulations - you need not argue further with someone who posits that your argument doesn't account for the possibility of you being a brain-in-a-vat.

Of course, Vinny knows this. He also knows that we disregard solipsism because to not do so leads to epistemological nihilism - where knowledge is impossible.

You can fuck off now, Vinny.