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========== Do you remember that cold you had when you
were 10? Or that shot you got before kindergarten? Or that guy who sneezed next to you while
you were watching Speed 2: Cruise Control. No? Well, your body does. Each of these is a time when you faced some
germy invader, and after you fought them off, your body stored a memory so it would recognize
these threats if they showed up again. Not in your brain – a cellular memory…
in your immune system. We’re learning that the immune system is
so adaptable and long-lasting that we might be able to engineer our bodies and become
immune to germs we’ve never met, or even give ourselves universal immunity. But how does this incredible army of cellular
guardians do its job? Are we so powerful, that we could ever be
immu...