The confirmation paradoxes that Hempel discovered shows that a red shoe confirms the hypotheis that all ravens are black, which implies we can do the ornithological study inside the door.

• 亨佩尔发现的确证悖论表明,一只粉红色的鞋确证假说“所有乌鸦都是黑的”,这意味着我们在屋子里不用出门就可以进行鸟类学研究,但这是违反我们的直觉的。