Imagine you are a doctor, and one of your patients is on the verge of dying from a tumor.
You can’t perform surgery but you have a ray gun, which can focus a high-intensity ray on the tumor and destroy it.
But there’s a problem: At this high intensity, the ray will also damage the healthy tissue it passes through. If you try to lower the intensity, it no longer has the energy to destroy the tumor.
How can you destroy the tumor without damaging the healthy tissue?
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