Why do I believe in the existence of atoms so small that I can't see them?

为什么我相信原子的存在,它是如此之小,以至于我根本就看不到它们

耶鲁公开课 - 死亡课程节选

How do I posit-- why do I believe in x-rays, even though I don't see them?

我如何证实,我为什么会相信X射线是存在的,尽管我压根看不见它

耶鲁公开课 - 死亡课程节选