Because you use light to communicate in sign language, and light is just an electromagnetic wave like radio but on another frequency. You just need to be in line of sight

You are viewing a single thread.
View all comments View context
3 points

Yeah probably true. I only thought to look it up because I knew active and passive sonar was a thing.

permalink
report
parent
reply

Showerthoughts

!showerthoughts@lemmy.world

Create post

A “Showerthought” is a simple term used to describe the thoughts that pop into your head while you’re doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.

Rules

  • All posts must be showerthoughts
  • The entire showerthought must be in the title
  • Posts must be original/unique
  • Be good to others - no bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia
  • Adhere to Lemmy’s Code of Conduct

Community stats

  • 5.9K

    Monthly active users

  • 1.3K

    Posts

  • 44K

    Comments