Is the Iron in our body different from the Iron used in construction? How did ancient cultures use meteoric iron without knowledge of metallurgy? What makes iron such a vital natural resource throughout human history? Why doesn’t iron in our blood react strongly to MRI machines? How does the imaginative concept of ""space swords"" link history and modern mythology around iron?

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Why do we still change clocks to Daylight Savings Time when so many people dislike it? Who came up with the idea in the first place? Why is there a movement to permanent Daylight Savings Time? Are farmers for or against Daylight Savings Time?

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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: sushiandwow, eigenfood, tripshed, bunchoatoms, jiceman and grizzletron.

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If nuclear submarines can generate their own water and oxygen underwater, why do they need to surface at all? Why are submarine propellers always at the back, while airplane propellers are usually at the front? How did submarines and the US Navy play a part in the discovery of the Titanic?

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What is the gold standard and how did it influence currency value historically? How did the transition from a gold standard to fiat currency shape modern economics? What led to the abolition of the gold standard in the US during the Great Depression? What impact did Executive Order 6102 have on private gold ownership in 1933? How does the US dollar derive its value without being tied to gold? What part did Isaac Newton play in helping gold become the standard precious metal of choice?

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Did you know a standard lock might have thousands of combination possibilities, yet yours might open someone else's door? How does a master key work such that it can open multiple locks without compromising security entirely? What makes lockpicking more of an art than a science, requiring skill and a deep understanding of how locks function? How can a particular ""jiggle-and-twist"" method sometimes allow a key to open unintended locks successfully? What surprising connections do locks and keys have with human ingenuity and security throughout history?

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Did you know that the original Monopoly board was circular as well as made from cloth? How have Monopoly games evolved over the years to create more engaging experiences for players? Can Monopoly actually reflect the negative impact of monopolies in the real world, rather than just an enjoyable pastime? What are some of the most interesting versions of Monopoly?

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What inspired George Ferris to create the first Ferris wheel at the Chicago World’s Fair in 1893? How tall was the original Ferris wheel, and what impressive structure did it aim to surpass? What unique challenges did engineers face to build the Ferris wheel, and how did they ensure its safety?

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What exactly are desiccants, and why are they commonly used in packaging? How does silica gel effectively trap moisture in humid environments? Can you explain the nanoporous structure of silica gel that makes it so efficient? Why do some silica gel packets change color when they reach capacity? Is silica gel really safe to use? Can you reuse them?

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How does sleepwalking work exactly? Are certain people more prone to it? What types of activities can sleepwalkers get up to? Are there specific triggers that cause sleepwalking? Is it true that waking a sleepwalker can be dangerous?

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How did Poker evolve into a cultural phenomenon beyond just a card game? What makes poker different from other casino games in terms of player competition and strategy? Can you explain the betting process in poker and how players make decisions during each round? Poker on TV often shows those probabilities of a winning hand. How do players calculate this when they're playing? Are there some standard probabilities we should know about?

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