Oddbean new post about login | logout Thinking a lot recently, about interesting signal propagation methods. Typical 2.4/5ghz wireless transmissions being omni-directional (insecure for 1). Of course, not counting you using a yagi steal wifi from far directional distances, or bridge distant buildings Been thinking about propagating ultrasound in water, between UAV nodes, and have been inspired by this pre-computer technology in the UK. A series of concave stones, used in sequence can propagate signal #science #physics #tech https://files.mastodon.social/media_attachments/files/111/175/787/846/215/332/original/f80358f09b8bf4a3.jpg https://files.mastodon.social/media_attachments/files/111/175/793/856/826/237/original/96ac074a89248712.jpg
