• 11 Posts
  • 315 Comments
Joined 1 year ago
cake
Cake day: July 1st, 2023

help-circle








  • I work night shifts. My manager one time called me around 2pm to ask me something menial and waking me up (as I was still sleeping for my next shift at 7pm).

    So naturally, I called him at 2AM when I was at work… because I had an “urgent” question about a work policy lol. He got the picture, and that shit never happened again





  • Thank you! That’s pretty neat. I tried 27% of 65

    I added two 10% increments (6.5+6.5)… but instead of adding 0.65 (1%) seven more times, I added a 5% increment (6.5/2 = 3.25) and then 2 increments of 1%

    So 6.5+6.5+3.25+0.65+0.65 = 17.55

    I still had to use a calculator to add those weird numbers (and also check my work), but it does seem really practical for easier numbers. I usually need percentages for pricing (i.e. discounts/tipping), and the percentages are normally in increments of 5%, so that’s pretty useful for figuring out a 15% or 75% of something real quick… or at least get me really close (when talking about something like $X.99)

    Regardless, I appreciate the head trick!

    Edit: I guess I could’ve done 30% and then subtracted 1% twice; but it’s the same issue (of adding weird numbers) with the same outcome anyway. So thanks again!


  • Huh… that made my brain do a few twists. The reference point for distance would be our own galaxy (I assume). So you would think that the furthest one would be the “oldest” due to expansion of the universe… so I would think that you’re correct in your correction?

    Unless they meant “older” in the sense of “discovered earlier”? I have no idea anymore, I guess they could argue it either way

    Edit: After re-reading it, I think they’re just referring “Younger” and “Older” to how the galaxies appear to us (due to the time it takes light to travel). As in, the newest discovery is “younger” because that’s the age that we can observe it as, by the time the light has reached us. Idk anymore, I know nothing lol






  • Lower frequencies (like the HF range) can propagate further due to reflection/refraction with the earth and the ionosphere. Increasing the frequency can lead to e-skip and troposhpeheric ducting. But even the HF range has shorter wavelengths than our brains, which operate in much lower frequencies (Hz vs MHz). So you would think that our brainwaves would pass through tin-foil much more easily

    But it’s the tin-foil’s electro-conduction that “foils” the electromagnetic waves’ (i.e radio waves’) ability to pass through it. But you would have to have no gaps in the tin-foil to completely block all waves from passing through. So like, an entire foil suit or a walking Faraday cage.

    TL;DR - it’s not about the length of the electromagnetic wave, it’s the electro-conduction (insulating) property of the tin-foil that matters