Some products feel like they've been around forever, but they're actually fairly recent inventions. Sliced bread, a kitchen staple, has been around for fewer than 100 years. It's tough to imagine life without the MacBook and iPhone, but they've only been around 20 years. It seems like there was never a time that we lived without Diet Coke, Post-It notes, or camera phones. However, some items that seem as old as time were created relatively recently.