But toothbrushes are ultrasonic. I can never find mine. | Hacker News

Hacker News new | past | comments | ask | show | jobs | submit

login

dghughes 5 months ago | parent | context | favorite | on: GE Aerospace Successfully Develops and Tests New H...

But toothbrushes are ultrasonic. I can never find mine.

banku_brougham 5 months ago [–]

the plasma ball is opaque to radar, making it hard to detect.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact