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A FIFO (First-In, First-Out) stack in computing is also known as a Push-down, Pull-out stack - records or events or items are pushed down at the top and pulled out at the [bottom]. A LIFO (Last-In, First-Out) is also known as a Push-down, Pop-out stack - records are pushed down from the top and pulled out from the top. You can imagine a FIBO or Push-down, Blow-out stack where you keep pushing events or to-do items (or emails) down at the top until the pressure reaches a certain point at which time the [bottom] of the stack ruptures and all the items in the queue blow out the [bottom] and scatter all over the [floor]. For some folks, their email inbox is a Push-down, Blow-out stack where any emails that get pushed down below the fold ([bottom] edge of the screen) essentially disappear from their reality and might as well have blown out all over the floor.
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