Explain Like I'm Five (Reddit)

https://www.reddit.com/r/explainlikeimfive/

• ELI5 : Why, among the 4 nordic countries, only Finland uses the euro currency while the others use the krone? (2026/03/22 18:14)

  what is special event happened with Finland but not other neighbors
• ELI5: If temperature is the average speed of molecules, why does wind feel cold? (2026/03/22 03:07)

  Crossposted from r/explainlikeimfive
• ELI5. Why are mosquitoes so hard to kill and do they serve a purpose? (2026/03/21 22:44)

  It's spring again; and I'm tired of the constant mosquito bites. I have tried several different kinds of sprays (permethrin, tetramethrin etc.), replacing the window screens, keeping windows and doors closed; but they still find a way. Why are they such a nuisance to kill? And do mosquitoes serve a purpose in the bigger picture? Like, some flies pollinate.
• ELI5: Why are airplane bathroom trash receptacles designed to involve so much skin contact? (2026/03/21 15:57)

  There has to be a logical explanation for this, but I’m seeing nothing online… Question is simple. The vast, vast majority of airplane bathrooms, regardless of age of plane, use a spring-loaded trash can lid that will snap closed, usually clamping whatever it is that you’re trying to throw into it. I’ll usually walk into a plane bathroom and see that thing munching on whatever the last person attempted to throw into it. A tiny number of planes have a pedal system, but still to operate a spring-loaded lid. Now, on the ground, I feel like we’ve designed a bunch of functional trash cans. Whether that is a sensor-operated lid, a slower release system on the spring so that it takes longer to snap closed, a pedal, or even just no lid at all, I feel like we have a million ways we are able to dispose of trash more conveniently. Are there regulations or engineering constraints that make airplane trash cans work the way that they do?
• ELI5: Why doesnt the gulf states send their oil through the red sea instead of shipping throught the straight of hormuz? (2026/03/21 14:21)

  Crossposted from r/explainlikeimfive
• ELI5: When recycling glass, why is it crushed and melted? Wouldn't it be easier to just sanitize and reuse the glass? (2026/03/21 10:50)

  Would that not be more efficient?! How does this process work?
• Eli5 how were log cabins/wooden buildings protected from rot, historically? (2026/03/21 03:21)

  Why didn't logs decay, or did they, and how were they replaced? Give me the play by play through history, when people lived in wooden buildings what kept them from rot and decay? Idk what flair was most appropriate.
• ELI5 what is .NET runtime for, and what does it do? (2026/03/20 23:31)

  I see it installed as a dependency for all kinds of games but can't really find an answer online that makes sense to me as to what it is. I'm majoring in computer engineering (RIP) so I feel like I should know what it is