Explain Like I'm Five (reddit)

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

• ELI5: Why is New Orleans being below sea level unsustainable but the Netherlands totally OK? (2026/05/05 01:01)

  I saw an article on my home page how NOLA is past the point of no return, but they are nowhere near the only area on earth near an ocean and below sea level, why them specifically?
• ELI5: If the S&P were to continue going up no matter what in long term, why not buy a leverage stock that’s 3x of it and hold it? (2026/05/04 15:04)

  If the S&P were to keep going up as it has in history, would it be smart just to do the 3x or 4x leverage? What’s the advantage or disadvantage of doing this? I understand that there’s higher volatility which means higher risk but in the long term it will be up so why not?
• ELI5: Why are we able to get really close to absolute zero without being able to reach it? (2026/05/04 02:17)

  Whenever I hear something about scientists trying to achieve absolute zero it’s always something like “researchers were able to get within 0.000023°K” where they get unbelievably close but never reach it. What makes this so difficult and what’s the main problem that stops them from reaching 0°K?
• Eli5: Why is it that when we do strength exercise, our muscles get sore the day after. But when we do cardio, the next day our heart doesnt feel sore. (2026/05/03 23:27)

  Crossposted from r/explainlikeimfive
• ELI5: what is Borderline Personality in observable terms? (2026/05/03 22:41)

  I’ve been trying to figure the best terms to put it in, it’s just a diagnosis that’s nebulous because of differential diagnoses. Please help me put it in simple terms
• ELI5: How do cows get protein from grass? (2026/05/03 20:07)

  For us humans and many other animals, we need protein to get the amino acids needed to make our own protein for the body, but grass i believe doesn't have any for the cow to get that big
• ELI5: Why do people perceive water to be more "delicious" when it's cold? And why other drinks (think tea) are the opposite? (2026/05/03 06:17)

  Crossposted from r/explainlikeimfive
• ELI5: What are the reasons behind birds being more vocal in the early morning compared to later in the day and at night? (2026/05/02 19:31)

  Crossposted from r/explainlikeimfive