Stack is one of those words you’d probably never use in a conversation – “How’s your stack treating you these days, John?” – but once you start noticing, it’s everywhere. Examples range from companies looking for “full stack developers” to startups sharing their “marketing stacks” online. The concept has even moved beyond technology. On Reddit, for instance, the biohacking “StackAdvice” community is looking for the ultimate cocktail of nutrients and supplements to optimize their brains. So what is a stack, exactly? Although the word has a few different meanings – in programming, the stack refers to a “last in, first…

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