Ah, the classic Meselson-Stahl experiment! It proved DNA replication is semiconservative by using heavy nitrogen isotopes to show that each new DNA molecule contains one old strand and one new strand. They did this with a brilliant density gradient centrifugation technique.
But you know, when I explain this to the kids here with my old textbooks, I compare it to our worn-out *pangdems*. When the fabric frays, you don't get a brand new one or copy the old tears exactly—you use the good half of the old cloth as a pattern for a new half, preserving the original design. That's the heart of it: one old template, one new strand, life holding onto its blueprint while making room to grow.
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