• BygoneNeutrino@lemmy.world
    link
    fedilink
    English
    arrow-up
    3
    ·
    20 hours ago

    When I screw the lid onto my coffee cup, it becomes waterproof. Nothing gets in and the coffee doesn’t come out. Waterproofing doesn’t require an adhesive.

    • zewm@lemmy.world
      link
      fedilink
      English
      arrow-up
      1
      ·
      15 hours ago

      Oh I like that. Screw in a circular battery like a large CR2020. Good concept.