Could Earth be the only planet with intelligent life?
0, 1, infinity.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Zero_one_infinity_rule" rel="nofollow noreferrer">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Zero_one_infinity_rule</a><p>I mean, it&#x27;s potentially possible Earth is the only planet with intelligent life (though highly, highly improbable).  But the moment we discover any other planet with intelligent life, then we must assume there are an infinite amount (if the universe is infinite).<p>Of course this brings up more questions about what is intelligence? Is a slime mold intelligent?