• 3 Posts
  • 41 Comments
Joined 1 year ago
cake
Cake day: June 12th, 2023

help-circle








  • Back when i was 18, I was dragging myself out of bed for work after waking up from my daily hour of sleep, and while I was in the shower I looked down and saw someone’s feet in the shower with me. I was a bit startled, but after looking around I realized I was alone. To make it even more creepy, the feet were reading my mind. I would think about wiggling my toes, and the toes would wiggle.

    I wasn’t until I reached down and tried to pick them up that I realized that they were my own feet.




  • I did something similar once to my own computer as an adult. I was trying to uninstall dropbox, but for some reason I forgot that there is an uninstaller tool for that. So I searched for all files with Dropbox in their directory, selected all of them, and deleted them.

    Unfortunately for me, well, you know how you can select a folder to sync to Dropbox when you set it up? I apparently somehow selected the user folder for that. Which caused the files for almost everything being displayed on screen to have Dropbox in their directory. And that meant I was deleting all the non-essential files (as in everything other than Sys32) on my computer.

    The only warning I had was when the number of files marked for deletion passed 100 gb. I stopped there and checked my work, but I couldn’t see any problems with my method at the time. My poor computer’s screen went black while it worked to delete EVERYTHING. I didn’t realize what I had done until the screen turned back on and showed an empty desktop.

    But at least I could finally reach 10 fps while running Minecraft!






  • The least temperamental kind to create and display are 540 nm (red) reflection holograms. To create, you get a laser pointer, gut it, turn it on for 15 minutes to let it stop doing funky diode stuff, set up your diorama behind the photo plate, and then shine the laser through the plate onto the diorama for however long your plate takes to develop. And to display it, you just need a point source of light, like a bright red LED.

    Compare this with a green or blue hologram, which at the low end needs a high quality laser, a vibration-cancelling optical table, and even with all this can still be ruined by someone coughing in the other room. Or a transmission hologram, which at minimum needs a beam-splitter to create and must be displayed with the same color laser or the scale will be magnified or shrunk a bit, unless you are willing to make a rainbow hologram which also requires either an optical-grade cylindrical mirror/lens or some experimenting with paper slits, followed by a second pass through projecting the master print on the rainbow print.

    I’m skipping a lot of details on the setup, but you get the gist. This all being said, the coolest holograms are rainbow holos


  • This is correct. The natural numbers are better known as the counting numbers, and do not include 0 or the negative numbers. I personally think the classification is a bit bullshit given how they really only matter in meatspace. I have never seen the distinction between integers and natural numbers come up in real mathematics